drivers/usb/typec/tcpm/tcpm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015-2017 Google, Inc
   4  *
   5  * USB Power Delivery protocol stack.
   6  */
   7
   8 #include <linux/completion.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/device.h>
  11 #include <linux/hrtimer.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kthread.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/property.h>
  20 #include <linux/sched/clock.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/pd.h>
  26 #include <linux/usb/pd_ado.h>
  27 #include <linux/usb/pd_bdo.h>
  28 #include <linux/usb/pd_ext_sdb.h>
  29 #include <linux/usb/pd_vdo.h>
  30 #include <linux/usb/role.h>
  31 #include <linux/usb/tcpm.h>
  32 #include <linux/usb/typec_altmode.h>
  33
  34 #include <uapi/linux/sched/types.h>
  35
  36 #define FOREACH_STATE(S)                        \
  37         S(INVALID_STATE),                       \
  38         S(TOGGLING),                    \
  39         S(CHECK_CONTAMINANT),                   \
  40         S(SRC_UNATTACHED),                      \
  41         S(SRC_ATTACH_WAIT),                     \
  42         S(SRC_ATTACHED),                        \
  43         S(SRC_STARTUP),                         \
  44         S(SRC_SEND_CAPABILITIES),               \
  45         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  46         S(SRC_NEGOTIATE_CAPABILITIES),          \
  47         S(SRC_TRANSITION_SUPPLY),               \
  48         S(SRC_READY),                           \
  49         S(SRC_WAIT_NEW_CAPABILITIES),           \
  50                                                 \
  51         S(SNK_UNATTACHED),                      \
  52         S(SNK_ATTACH_WAIT),                     \
  53         S(SNK_DEBOUNCED),                       \
  54         S(SNK_ATTACHED),                        \
  55         S(SNK_STARTUP),                         \
  56         S(SNK_DISCOVERY),                       \
  57         S(SNK_DISCOVERY_DEBOUNCE),              \
  58         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  59         S(SNK_WAIT_CAPABILITIES),               \
  60         S(SNK_NEGOTIATE_CAPABILITIES),          \
  61         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  62         S(SNK_TRANSITION_SINK),                 \
  63         S(SNK_TRANSITION_SINK_VBUS),            \
  64         S(SNK_READY),                           \
  65                                                 \
  66         S(ACC_UNATTACHED),                      \
  67         S(DEBUG_ACC_ATTACHED),                  \
  68         S(AUDIO_ACC_ATTACHED),                  \
  69         S(AUDIO_ACC_DEBOUNCE),                  \
  70                                                 \
  71         S(HARD_RESET_SEND),                     \
  72         S(HARD_RESET_START),                    \
  73         S(SRC_HARD_RESET_VBUS_OFF),             \
  74         S(SRC_HARD_RESET_VBUS_ON),              \
  75         S(SNK_HARD_RESET_SINK_OFF),             \
  76         S(SNK_HARD_RESET_WAIT_VBUS),            \
  77         S(SNK_HARD_RESET_SINK_ON),              \
  78                                                 \
  79         S(SOFT_RESET),                          \
  80         S(SRC_SOFT_RESET_WAIT_SNK_TX),          \
  81         S(SNK_SOFT_RESET),                      \
  82         S(SOFT_RESET_SEND),                     \
  83                                                 \
  84         S(DR_SWAP_ACCEPT),                      \
  85         S(DR_SWAP_SEND),                        \
  86         S(DR_SWAP_SEND_TIMEOUT),                \
  87         S(DR_SWAP_CANCEL),                      \
  88         S(DR_SWAP_CHANGE_DR),                   \
  89                                                 \
  90         S(PR_SWAP_ACCEPT),                      \
  91         S(PR_SWAP_SEND),                        \
  92         S(PR_SWAP_SEND_TIMEOUT),                \
  93         S(PR_SWAP_CANCEL),                      \
  94         S(PR_SWAP_START),                       \
  95         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  96         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  97         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  98         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  99         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
 100         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
 101         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
 102                                                 \
 103         S(VCONN_SWAP_ACCEPT),                   \
 104         S(VCONN_SWAP_SEND),                     \
 105         S(VCONN_SWAP_SEND_TIMEOUT),             \
 106         S(VCONN_SWAP_CANCEL),                   \
 107         S(VCONN_SWAP_START),                    \
 108         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 109         S(VCONN_SWAP_TURN_ON_VCONN),            \
 110         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 111                                                 \
 112         S(FR_SWAP_SEND),                        \
 113         S(FR_SWAP_SEND_TIMEOUT),                \
 114         S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),                   \
 115         S(FR_SWAP_SNK_SRC_NEW_SINK_READY),              \
 116         S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
 117         S(FR_SWAP_CANCEL),                      \
 118                                                 \
 119         S(SNK_TRY),                             \
 120         S(SNK_TRY_WAIT),                        \
 121         S(SNK_TRY_WAIT_DEBOUNCE),               \
 122         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 123         S(SRC_TRYWAIT),                         \
 124         S(SRC_TRYWAIT_DEBOUNCE),                \
 125         S(SRC_TRYWAIT_UNATTACHED),              \
 126                                                 \
 127         S(SRC_TRY),                             \
 128         S(SRC_TRY_WAIT),                        \
 129         S(SRC_TRY_DEBOUNCE),                    \
 130         S(SNK_TRYWAIT),                         \
 131         S(SNK_TRYWAIT_DEBOUNCE),                \
 132         S(SNK_TRYWAIT_VBUS),                    \
 133         S(BIST_RX),                             \
 134                                                 \
 135         S(GET_STATUS_SEND),                     \
 136         S(GET_STATUS_SEND_TIMEOUT),             \
 137         S(GET_PPS_STATUS_SEND),                 \
 138         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 139                                                 \
 140         S(GET_SINK_CAP),                        \
 141         S(GET_SINK_CAP_TIMEOUT),                \
 142                                                 \
 143         S(ERROR_RECOVERY),                      \
 144         S(PORT_RESET),                          \
 145         S(PORT_RESET_WAIT_OFF),                 \
 146                                                 \
 147         S(AMS_START),                           \
 148         S(CHUNK_NOT_SUPP)
 149
 150 #define FOREACH_AMS(S)                          \
 151         S(NONE_AMS),                            \
 152         S(POWER_NEGOTIATION),                   \
 153         S(GOTOMIN),                             \
 154         S(SOFT_RESET_AMS),                      \
 155         S(HARD_RESET),                          \
 156         S(CABLE_RESET),                         \
 157         S(GET_SOURCE_CAPABILITIES),             \
 158         S(GET_SINK_CAPABILITIES),               \
 159         S(POWER_ROLE_SWAP),                     \
 160         S(FAST_ROLE_SWAP),                      \
 161         S(DATA_ROLE_SWAP),                      \
 162         S(VCONN_SWAP),                          \
 163         S(SOURCE_ALERT),                        \
 164         S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
 165         S(GETTING_SOURCE_SINK_STATUS),          \
 166         S(GETTING_BATTERY_CAPABILITIES),        \
 167         S(GETTING_BATTERY_STATUS),              \
 168         S(GETTING_MANUFACTURER_INFORMATION),    \
 169         S(SECURITY),                            \
 170         S(FIRMWARE_UPDATE),                     \
 171         S(DISCOVER_IDENTITY),                   \
 172         S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
 173         S(DISCOVER_SVIDS),                      \
 174         S(DISCOVER_MODES),                      \
 175         S(DFP_TO_UFP_ENTER_MODE),               \
 176         S(DFP_TO_UFP_EXIT_MODE),                \
 177         S(DFP_TO_CABLE_PLUG_ENTER_MODE),        \
 178         S(DFP_TO_CABLE_PLUG_EXIT_MODE),         \
 179         S(ATTENTION),                           \
 180         S(BIST),                                \
 181         S(UNSTRUCTURED_VDMS),                   \
 182         S(STRUCTURED_VDMS),                     \
 183         S(COUNTRY_INFO),                        \
 184         S(COUNTRY_CODES)
 185
 186 #define GENERATE_ENUM(e)        e
 187 #define GENERATE_STRING(s)      #s
 188
 189 enum tcpm_state {
 190         FOREACH_STATE(GENERATE_ENUM)
 191 };
 192
 193 static const char * const tcpm_states[] = {
 194         FOREACH_STATE(GENERATE_STRING)
 195 };
 196
 197 enum tcpm_ams {
 198         FOREACH_AMS(GENERATE_ENUM)
 199 };
 200
 201 static const char * const tcpm_ams_str[] = {
 202         FOREACH_AMS(GENERATE_STRING)
 203 };
 204
 205 enum vdm_states {
 206         VDM_STATE_ERR_BUSY = -3,
 207         VDM_STATE_ERR_SEND = -2,
 208         VDM_STATE_ERR_TMOUT = -1,
 209         VDM_STATE_DONE = 0,
 210         /* Anything >0 represents an active state */
 211         VDM_STATE_READY = 1,
 212         VDM_STATE_BUSY = 2,
 213         VDM_STATE_WAIT_RSP_BUSY = 3,
 214         VDM_STATE_SEND_MESSAGE = 4,
 215 };
 216
 217 enum pd_msg_request {
 218         PD_MSG_NONE = 0,
 219         PD_MSG_CTRL_REJECT,
 220         PD_MSG_CTRL_WAIT,
 221         PD_MSG_CTRL_NOT_SUPP,
 222         PD_MSG_DATA_SINK_CAP,
 223         PD_MSG_DATA_SOURCE_CAP,
 224 };
 225
 226 enum adev_actions {
 227         ADEV_NONE = 0,
 228         ADEV_NOTIFY_USB_AND_QUEUE_VDM,
 229         ADEV_QUEUE_VDM,
 230         ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
 231         ADEV_ATTENTION,
 232 };
 233
 234 /*
 235  * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
 236  * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
 237  * Version 1.2"
 238  */
 239 enum frs_typec_current {
 240         FRS_NOT_SUPPORTED,
 241         FRS_DEFAULT_POWER,
 242         FRS_5V_1P5A,
 243         FRS_5V_3A,
 244 };
 245
 246 /* Events from low level driver */
 247
 248 #define TCPM_CC_EVENT           BIT(0)
 249 #define TCPM_VBUS_EVENT         BIT(1)
 250 #define TCPM_RESET_EVENT        BIT(2)
 251 #define TCPM_FRS_EVENT          BIT(3)
 252 #define TCPM_SOURCING_VBUS      BIT(4)
 253 #define TCPM_PORT_CLEAN         BIT(5)
 254
 255 #define LOG_BUFFER_ENTRIES      1024
 256 #define LOG_BUFFER_ENTRY_SIZE   128
 257
 258 /* Alternate mode support */
 259
 260 #define SVID_DISCOVERY_MAX      16
 261 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 262
 263 #define GET_SINK_CAP_RETRY_MS   100
 264 #define SEND_DISCOVER_RETRY_MS  100
 265
 266 struct pd_mode_data {
 267         int svid_index;         /* current SVID index           */
 268         int nsvids;
 269         u16 svids[SVID_DISCOVERY_MAX];
 270         int altmodes;           /* number of alternate modes    */
 271         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 272 };
 273
 274 /*
 275  * @min_volt: Actual min voltage at the local port
 276  * @req_min_volt: Requested min voltage to the port partner
 277  * @max_volt: Actual max voltage at the local port
 278  * @req_max_volt: Requested max voltage to the port partner
 279  * @max_curr: Actual max current at the local port
 280  * @req_max_curr: Requested max current of the port partner
 281  * @req_out_volt: Requested output voltage to the port partner
 282  * @req_op_curr: Requested operating current to the port partner
 283  * @supported: Parter has at least one APDO hence supports PPS
 284  * @active: PPS mode is active
 285  */
 286 struct pd_pps_data {
 287         u32 min_volt;
 288         u32 req_min_volt;
 289         u32 max_volt;
 290         u32 req_max_volt;
 291         u32 max_curr;
 292         u32 req_max_curr;
 293         u32 req_out_volt;
 294         u32 req_op_curr;
 295         bool supported;
 296         bool active;
 297 };
 298
 299 struct tcpm_port {
 300         struct device *dev;
 301
 302         struct mutex lock;              /* tcpm state machine lock */
 303         struct kthread_worker *wq;
 304
 305         struct typec_capability typec_caps;
 306         struct typec_port *typec_port;
 307
 308         struct tcpc_dev *tcpc;
 309         struct usb_role_switch *role_sw;
 310
 311         enum typec_role vconn_role;
 312         enum typec_role pwr_role;
 313         enum typec_data_role data_role;
 314         enum typec_pwr_opmode pwr_opmode;
 315
 316         struct usb_pd_identity partner_ident;
 317         struct typec_partner_desc partner_desc;
 318         struct typec_partner *partner;
 319
 320         enum typec_cc_status cc_req;
 321         enum typec_cc_status src_rp;    /* work only if pd_supported == false */
 322
 323         enum typec_cc_status cc1;
 324         enum typec_cc_status cc2;
 325         enum typec_cc_polarity polarity;
 326
 327         bool attached;
 328         bool connected;
 329         bool registered;
 330         bool pd_supported;
 331         enum typec_port_type port_type;
 332
 333         /*
 334          * Set to true when vbus is greater than VSAFE5V min.
 335          * Set to false when vbus falls below vSinkDisconnect max threshold.
 336          */
 337         bool vbus_present;
 338
 339         /*
 340          * Set to true when vbus is less than VSAFE0V max.
 341          * Set to false when vbus is greater than VSAFE0V max.
 342          */
 343         bool vbus_vsafe0v;
 344
 345         bool vbus_never_low;
 346         bool vbus_source;
 347         bool vbus_charge;
 348
 349         /* Set to true when Discover_Identity Command is expected to be sent in Ready states. */
 350         bool send_discover;
 351         bool op_vsafe5v;
 352
 353         int try_role;
 354         int try_snk_count;
 355         int try_src_count;
 356
 357         enum pd_msg_request queued_message;
 358
 359         enum tcpm_state enter_state;
 360         enum tcpm_state prev_state;
 361         enum tcpm_state state;
 362         enum tcpm_state delayed_state;
 363         ktime_t delayed_runtime;
 364         unsigned long delay_ms;
 365
 366         spinlock_t pd_event_lock;
 367         u32 pd_events;
 368
 369         struct kthread_work event_work;
 370         struct hrtimer state_machine_timer;
 371         struct kthread_work state_machine;
 372         struct hrtimer vdm_state_machine_timer;
 373         struct kthread_work vdm_state_machine;
 374         struct hrtimer enable_frs_timer;
 375         struct kthread_work enable_frs;
 376         struct hrtimer send_discover_timer;
 377         struct kthread_work send_discover_work;
 378         bool state_machine_running;
 379         /* Set to true when VDM State Machine has following actions. */
 380         bool vdm_sm_running;
 381
 382         struct completion tx_complete;
 383         enum tcpm_transmit_status tx_status;
 384
 385         struct mutex swap_lock;         /* swap command lock */
 386         bool swap_pending;
 387         bool non_pd_role_swap;
 388         struct completion swap_complete;
 389         int swap_status;
 390
 391         unsigned int negotiated_rev;
 392         unsigned int message_id;
 393         unsigned int caps_count;
 394         unsigned int hard_reset_count;
 395         bool pd_capable;
 396         bool explicit_contract;
 397         unsigned int rx_msgid;
 398
 399         /* USB PD objects */
 400         struct usb_power_delivery *pd;
 401         struct usb_power_delivery_capabilities *port_source_caps;
 402         struct usb_power_delivery_capabilities *port_sink_caps;
 403         struct usb_power_delivery *partner_pd;
 404         struct usb_power_delivery_capabilities *partner_source_caps;
 405         struct usb_power_delivery_capabilities *partner_sink_caps;
 406
 407         /* Partner capabilities/requests */
 408         u32 sink_request;
 409         u32 source_caps[PDO_MAX_OBJECTS];
 410         unsigned int nr_source_caps;
 411         u32 sink_caps[PDO_MAX_OBJECTS];
 412         unsigned int nr_sink_caps;
 413
 414         /* Local capabilities */
 415         u32 src_pdo[PDO_MAX_OBJECTS];
 416         unsigned int nr_src_pdo;
 417         u32 snk_pdo[PDO_MAX_OBJECTS];
 418         unsigned int nr_snk_pdo;
 419         u32 snk_vdo_v1[VDO_MAX_OBJECTS];
 420         unsigned int nr_snk_vdo_v1;
 421         u32 snk_vdo[VDO_MAX_OBJECTS];
 422         unsigned int nr_snk_vdo;
 423
 424         unsigned int operating_snk_mw;
 425         bool update_sink_caps;
 426
 427         /* Requested current / voltage to the port partner */
 428         u32 req_current_limit;
 429         u32 req_supply_voltage;
 430         /* Actual current / voltage limit of the local port */
 431         u32 current_limit;
 432         u32 supply_voltage;
 433
 434         /* Used to export TA voltage and current */
 435         struct power_supply *psy;
 436         struct power_supply_desc psy_desc;
 437         enum power_supply_usb_type usb_type;
 438
 439         u32 bist_request;
 440
 441         /* PD state for Vendor Defined Messages */
 442         enum vdm_states vdm_state;
 443         u32 vdm_retries;
 444         /* next Vendor Defined Message to send */
 445         u32 vdo_data[VDO_MAX_SIZE];
 446         u8 vdo_count;
 447         /* VDO to retry if UFP responder replied busy */
 448         u32 vdo_retry;
 449
 450         /* PPS */
 451         struct pd_pps_data pps_data;
 452         struct completion pps_complete;
 453         bool pps_pending;
 454         int pps_status;
 455
 456         /* Alternate mode data */
 457         struct pd_mode_data mode_data;
 458         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 459         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 460
 461         /* Deadline in jiffies to exit src_try_wait state */
 462         unsigned long max_wait;
 463
 464         /* port belongs to a self powered device */
 465         bool self_powered;
 466
 467         /* Sink FRS */
 468         enum frs_typec_current new_source_frs_current;
 469
 470         /* Sink caps have been queried */
 471         bool sink_cap_done;
 472
 473         /* Collision Avoidance and Atomic Message Sequence */
 474         enum tcpm_state upcoming_state;
 475         enum tcpm_ams ams;
 476         enum tcpm_ams next_ams;
 477         bool in_ams;
 478
 479         /* Auto vbus discharge status */
 480         bool auto_vbus_discharge_enabled;
 481
 482         /*
 483          * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
 484          * the actual current limit after RX of PD_CTRL_PSRDY for PD link,
 485          * SNK_READY for non-pd link.
 486          */
 487         bool slow_charger_loop;
 488
 489         /*
 490          * When true indicates that the lower level drivers indicate potential presence
 491          * of contaminant in the connector pins based on the tcpm state machine
 492          * transitions.
 493          */
 494         bool potential_contaminant;
 495 #ifdef CONFIG_DEBUG_FS
 496         struct dentry *dentry;
 497         struct mutex logbuffer_lock;    /* log buffer access lock */
 498         int logbuffer_head;
 499         int logbuffer_tail;
 500         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 501 #endif
 502 };
 503
 504 struct pd_rx_event {
 505         struct kthread_work work;
 506         struct tcpm_port *port;
 507         struct pd_message msg;
 508 };
 509
 510 static const char * const pd_rev[] = {
 511         [PD_REV10]              = "rev1",
 512         [PD_REV20]              = "rev2",
 513         [PD_REV30]              = "rev3",
 514 };
 515
 516 #define tcpm_cc_is_sink(cc) \
 517         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 518          (cc) == TYPEC_CC_RP_3_0)
 519
 520 /* As long as cc is pulled up, we can consider it as sink. */
 521 #define tcpm_port_is_sink(port) \
 522         (tcpm_cc_is_sink((port)->cc1) || tcpm_cc_is_sink((port)->cc2))
 523
 524 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 525 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 526 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 527
 528 #define tcpm_port_is_source(port) \
 529         ((tcpm_cc_is_source((port)->cc1) && \
 530          !tcpm_cc_is_source((port)->cc2)) || \
 531          (tcpm_cc_is_source((port)->cc2) && \
 532           !tcpm_cc_is_source((port)->cc1)))
 533
 534 #define tcpm_port_is_debug(port) \
 535         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 536
 537 #define tcpm_port_is_audio(port) \
 538         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 539
 540 #define tcpm_port_is_audio_detached(port) \
 541         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 542          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 543
 544 #define tcpm_try_snk(port) \
 545         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 546         (port)->port_type == TYPEC_PORT_DRP)
 547
 548 #define tcpm_try_src(port) \
 549         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 550         (port)->port_type == TYPEC_PORT_DRP)
 551
 552 #define tcpm_data_role_for_source(port) \
 553         ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
 554         TYPEC_DEVICE : TYPEC_HOST)
 555
 556 #define tcpm_data_role_for_sink(port) \
 557         ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
 558         TYPEC_HOST : TYPEC_DEVICE)
 559
 560 #define tcpm_sink_tx_ok(port) \
 561         (tcpm_port_is_sink(port) && \
 562         ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
 563
 564 #define tcpm_wait_for_discharge(port) \
 565         (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
 566
 567 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 568 {
 569         if (port->port_type == TYPEC_PORT_DRP) {
 570                 if (port->try_role == TYPEC_SINK)
 571                         return SNK_UNATTACHED;
 572                 else if (port->try_role == TYPEC_SOURCE)
 573                         return SRC_UNATTACHED;
 574                 /* Fall through to return SRC_UNATTACHED */
 575         } else if (port->port_type == TYPEC_PORT_SNK) {
 576                 return SNK_UNATTACHED;
 577         }
 578         return SRC_UNATTACHED;
 579 }
 580
 581 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 582 {
 583         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 584                 port->cc2 == TYPEC_CC_OPEN) ||
 585                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 586                                     port->cc1 == TYPEC_CC_OPEN) ||
 587                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 588                                     port->cc2 == TYPEC_CC_OPEN)));
 589 }
 590
 591 /*
 592  * Logging
 593  */
 594
 595 #ifdef CONFIG_DEBUG_FS
 596
 597 static bool tcpm_log_full(struct tcpm_port *port)
 598 {
 599         return port->logbuffer_tail ==
 600                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 601 }
 602
 603 __printf(2, 0)
 604 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 605 {
 606         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 607         u64 ts_nsec = local_clock();
 608         unsigned long rem_nsec;
 609
 610         mutex_lock(&port->logbuffer_lock);
 611         if (!port->logbuffer[port->logbuffer_head]) {
 612                 port->logbuffer[port->logbuffer_head] =
 613                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 614                 if (!port->logbuffer[port->logbuffer_head]) {
 615                         mutex_unlock(&port->logbuffer_lock);
 616                         return;
 617                 }
 618         }
 619
 620         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 621
 622         if (tcpm_log_full(port)) {
 623                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 624                 strcpy(tmpbuffer, "overflow");
 625         }
 626
 627         if (port->logbuffer_head < 0 ||
 628             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 629                 dev_warn(port->dev,
 630                          "Bad log buffer index %d\n", port->logbuffer_head);
 631                 goto abort;
 632         }
 633
 634         if (!port->logbuffer[port->logbuffer_head]) {
 635                 dev_warn(port->dev,
 636                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 637                 goto abort;
 638         }
 639
 640         rem_nsec = do_div(ts_nsec, 1000000000);
 641         scnprintf(port->logbuffer[port->logbuffer_head],
 642                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 643                   (unsigned long)ts_nsec, rem_nsec / 1000,
 644                   tmpbuffer);
 645         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 646
 647 abort:
 648         mutex_unlock(&port->logbuffer_lock);
 649 }
 650
 651 __printf(2, 3)
 652 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 653 {
 654         va_list args;
 655
 656         /* Do not log while disconnected and unattached */
 657         if (tcpm_port_is_disconnected(port) &&
 658             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 659              port->state == TOGGLING || port->state == CHECK_CONTAMINANT))
 660                 return;
 661
 662         va_start(args, fmt);
 663         _tcpm_log(port, fmt, args);
 664         va_end(args);
 665 }
 666
 667 __printf(2, 3)
 668 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 669 {
 670         va_list args;
 671
 672         va_start(args, fmt);
 673         _tcpm_log(port, fmt, args);
 674         va_end(args);
 675 }
 676
 677 static void tcpm_log_source_caps(struct tcpm_port *port)
 678 {
 679         int i;
 680
 681         for (i = 0; i < port->nr_source_caps; i++) {
 682                 u32 pdo = port->source_caps[i];
 683                 enum pd_pdo_type type = pdo_type(pdo);
 684                 char msg[64];
 685
 686                 switch (type) {
 687                 case PDO_TYPE_FIXED:
 688                         scnprintf(msg, sizeof(msg),
 689                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 690                                   pdo_fixed_voltage(pdo),
 691                                   pdo_max_current(pdo),
 692                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 693                                                         "R" : "",
 694                                   (pdo & PDO_FIXED_SUSPEND) ?
 695                                                         "S" : "",
 696                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 697                                                         "H" : "",
 698                                   (pdo & PDO_FIXED_USB_COMM) ?
 699                                                         "U" : "",
 700                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 701                                                         "D" : "",
 702                                   (pdo & PDO_FIXED_EXTPOWER) ?
 703                                                         "E" : "");
 704                         break;
 705                 case PDO_TYPE_VAR:
 706                         scnprintf(msg, sizeof(msg),
 707                                   "%u-%u mV, %u mA",
 708                                   pdo_min_voltage(pdo),
 709                                   pdo_max_voltage(pdo),
 710                                   pdo_max_current(pdo));
 711                         break;
 712                 case PDO_TYPE_BATT:
 713                         scnprintf(msg, sizeof(msg),
 714                                   "%u-%u mV, %u mW",
 715                                   pdo_min_voltage(pdo),
 716                                   pdo_max_voltage(pdo),
 717                                   pdo_max_power(pdo));
 718                         break;
 719                 case PDO_TYPE_APDO:
 720                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 721                                 scnprintf(msg, sizeof(msg),
 722                                           "%u-%u mV, %u mA",
 723                                           pdo_pps_apdo_min_voltage(pdo),
 724                                           pdo_pps_apdo_max_voltage(pdo),
 725                                           pdo_pps_apdo_max_current(pdo));
 726                         else
 727                                 strcpy(msg, "undefined APDO");
 728                         break;
 729                 default:
 730                         strcpy(msg, "undefined");
 731                         break;
 732                 }
 733                 tcpm_log(port, " PDO %d: type %d, %s",
 734                          i, type, msg);
 735         }
 736 }
 737
 738 static int tcpm_debug_show(struct seq_file *s, void *v)
 739 {
 740         struct tcpm_port *port = s->private;
 741         int tail;
 742
 743         mutex_lock(&port->logbuffer_lock);
 744         tail = port->logbuffer_tail;
 745         while (tail != port->logbuffer_head) {
 746                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 747                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 748         }
 749         if (!seq_has_overflowed(s))
 750                 port->logbuffer_tail = tail;
 751         mutex_unlock(&port->logbuffer_lock);
 752
 753         return 0;
 754 }
 755 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 756
 757 static void tcpm_debugfs_init(struct tcpm_port *port)
 758 {
 759         char name[NAME_MAX];
 760
 761         mutex_init(&port->logbuffer_lock);
 762         snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
 763         port->dentry = debugfs_create_dir(name, usb_debug_root);
 764         debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
 765                             &tcpm_debug_fops);
 766 }
 767
 768 static void tcpm_debugfs_exit(struct tcpm_port *port)
 769 {
 770         int i;
 771
 772         mutex_lock(&port->logbuffer_lock);
 773         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 774                 kfree(port->logbuffer[i]);
 775                 port->logbuffer[i] = NULL;
 776         }
 777         mutex_unlock(&port->logbuffer_lock);
 778
 779         debugfs_remove(port->dentry);
 780 }
 781
 782 #else
 783
 784 __printf(2, 3)
 785 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 786 __printf(2, 3)
 787 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 788 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 789 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 790 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 791
 792 #endif
 793
 794 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
 795 {
 796         tcpm_log(port, "cc:=%d", cc);
 797         port->cc_req = cc;
 798         port->tcpc->set_cc(port->tcpc, cc);
 799 }
 800
 801 static int tcpm_enable_auto_vbus_discharge(struct tcpm_port *port, bool enable)
 802 {
 803         int ret = 0;
 804
 805         if (port->tcpc->enable_auto_vbus_discharge) {
 806                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, enable);
 807                 tcpm_log_force(port, "%s vbus discharge ret:%d", enable ? "enable" : "disable",
 808                                ret);
 809                 if (!ret)
 810                         port->auto_vbus_discharge_enabled = enable;
 811         }
 812
 813         return ret;
 814 }
 815
 816 static void tcpm_apply_rc(struct tcpm_port *port)
 817 {
 818         /*
 819          * TCPCI: Move to APPLY_RC state to prevent disconnect during PR_SWAP
 820          * when Vbus auto discharge on disconnect is enabled.
 821          */
 822         if (port->tcpc->enable_auto_vbus_discharge && port->tcpc->apply_rc) {
 823                 tcpm_log(port, "Apply_RC");
 824                 port->tcpc->apply_rc(port->tcpc, port->cc_req, port->polarity);
 825                 tcpm_enable_auto_vbus_discharge(port, false);
 826         }
 827 }
 828
 829 /*
 830  * Determine RP value to set based on maximum current supported
 831  * by a port if configured as source.
 832  * Returns CC value to report to link partner.
 833  */
 834 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 835 {
 836         const u32 *src_pdo = port->src_pdo;
 837         int nr_pdo = port->nr_src_pdo;
 838         int i;
 839
 840         if (!port->pd_supported)
 841                 return port->src_rp;
 842
 843         /*
 844          * Search for first entry with matching voltage.
 845          * It should report the maximum supported current.
 846          */
 847         for (i = 0; i < nr_pdo; i++) {
 848                 const u32 pdo = src_pdo[i];
 849
 850                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 851                     pdo_fixed_voltage(pdo) == 5000) {
 852                         unsigned int curr = pdo_max_current(pdo);
 853
 854                         if (curr >= 3000)
 855                                 return TYPEC_CC_RP_3_0;
 856                         else if (curr >= 1500)
 857                                 return TYPEC_CC_RP_1_5;
 858                         return TYPEC_CC_RP_DEF;
 859                 }
 860         }
 861
 862         return TYPEC_CC_RP_DEF;
 863 }
 864
 865 static void tcpm_ams_finish(struct tcpm_port *port)
 866 {
 867         tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
 868
 869         if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
 870                 if (port->negotiated_rev >= PD_REV30)
 871                         tcpm_set_cc(port, SINK_TX_OK);
 872                 else
 873                         tcpm_set_cc(port, SINK_TX_NG);
 874         } else if (port->pwr_role == TYPEC_SOURCE) {
 875                 tcpm_set_cc(port, tcpm_rp_cc(port));
 876         }
 877
 878         port->in_ams = false;
 879         port->ams = NONE_AMS;
 880 }
 881
 882 static int tcpm_pd_transmit(struct tcpm_port *port,
 883                             enum tcpm_transmit_type type,
 884                             const struct pd_message *msg)
 885 {
 886         unsigned long timeout;
 887         int ret;
 888
 889         if (msg)
 890                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 891         else
 892                 tcpm_log(port, "PD TX, type: %#x", type);
 893
 894         reinit_completion(&port->tx_complete);
 895         ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
 896         if (ret < 0)
 897                 return ret;
 898
 899         mutex_unlock(&port->lock);
 900         timeout = wait_for_completion_timeout(&port->tx_complete,
 901                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 902         mutex_lock(&port->lock);
 903         if (!timeout)
 904                 return -ETIMEDOUT;
 905
 906         switch (port->tx_status) {
 907         case TCPC_TX_SUCCESS:
 908                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 909                 /*
 910                  * USB PD rev 2.0, 8.3.2.2.1:
 911                  * USB PD rev 3.0, 8.3.2.1.3:
 912                  * "... Note that every AMS is Interruptible until the first
 913                  * Message in the sequence has been successfully sent (GoodCRC
 914                  * Message received)."
 915                  */
 916                 if (port->ams != NONE_AMS)
 917                         port->in_ams = true;
 918                 break;
 919         case TCPC_TX_DISCARDED:
 920                 ret = -EAGAIN;
 921                 break;
 922         case TCPC_TX_FAILED:
 923         default:
 924                 ret = -EIO;
 925                 break;
 926         }
 927
 928         /* Some AMS don't expect responses. Finish them here. */
 929         if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
 930                 tcpm_ams_finish(port);
 931
 932         return ret;
 933 }
 934
 935 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 936                                enum tcpm_transmit_status status)
 937 {
 938         tcpm_log(port, "PD TX complete, status: %u", status);
 939         port->tx_status = status;
 940         complete(&port->tx_complete);
 941 }
 942 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 943
 944 static int tcpm_mux_set(struct tcpm_port *port, int state,
 945                         enum usb_role usb_role,
 946                         enum typec_orientation orientation)
 947 {
 948         int ret;
 949
 950         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 951                  state, usb_role, orientation);
 952
 953         ret = typec_set_orientation(port->typec_port, orientation);
 954         if (ret)
 955                 return ret;
 956
 957         if (port->role_sw) {
 958                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 959                 if (ret)
 960                         return ret;
 961         }
 962
 963         return typec_set_mode(port->typec_port, state);
 964 }
 965
 966 static int tcpm_set_polarity(struct tcpm_port *port,
 967                              enum typec_cc_polarity polarity)
 968 {
 969         int ret;
 970
 971         tcpm_log(port, "polarity %d", polarity);
 972
 973         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 974         if (ret < 0)
 975                 return ret;
 976
 977         port->polarity = polarity;
 978
 979         return 0;
 980 }
 981
 982 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 983 {
 984         int ret;
 985
 986         tcpm_log(port, "vconn:=%d", enable);
 987
 988         ret = port->tcpc->set_vconn(port->tcpc, enable);
 989         if (!ret) {
 990                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 991                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 992         }
 993
 994         return ret;
 995 }
 996
 997 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 998 {
 999         enum typec_cc_status cc;
1000         u32 limit;
1001
1002         cc = port->polarity ? port->cc2 : port->cc1;
1003         switch (cc) {
1004         case TYPEC_CC_RP_1_5:
1005                 limit = 1500;
1006                 break;
1007         case TYPEC_CC_RP_3_0:
1008                 limit = 3000;
1009                 break;
1010         case TYPEC_CC_RP_DEF:
1011         default:
1012                 if (port->tcpc->get_current_limit)
1013                         limit = port->tcpc->get_current_limit(port->tcpc);
1014                 else
1015                         limit = 0;
1016                 break;
1017         }
1018
1019         return limit;
1020 }
1021
1022 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
1023 {
1024         int ret = -EOPNOTSUPP;
1025
1026         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
1027
1028         port->supply_voltage = mv;
1029         port->current_limit = max_ma;
1030         power_supply_changed(port->psy);
1031
1032         if (port->tcpc->set_current_limit)
1033                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
1034
1035         return ret;
1036 }
1037
1038 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
1039 {
1040         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
1041                                      port->data_role);
1042 }
1043
1044 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
1045                           enum typec_role role, enum typec_data_role data)
1046 {
1047         enum typec_orientation orientation;
1048         enum usb_role usb_role;
1049         int ret;
1050
1051         if (port->polarity == TYPEC_POLARITY_CC1)
1052                 orientation = TYPEC_ORIENTATION_NORMAL;
1053         else
1054                 orientation = TYPEC_ORIENTATION_REVERSE;
1055
1056         if (port->typec_caps.data == TYPEC_PORT_DRD) {
1057                 if (data == TYPEC_HOST)
1058                         usb_role = USB_ROLE_HOST;
1059                 else
1060                         usb_role = USB_ROLE_DEVICE;
1061         } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1062                 if (data == TYPEC_HOST) {
1063                         if (role == TYPEC_SOURCE)
1064                                 usb_role = USB_ROLE_HOST;
1065                         else
1066                                 usb_role = USB_ROLE_NONE;
1067                 } else {
1068                         return -ENOTSUPP;
1069                 }
1070         } else {
1071                 if (data == TYPEC_DEVICE) {
1072                         if (role == TYPEC_SINK)
1073                                 usb_role = USB_ROLE_DEVICE;
1074                         else
1075                                 usb_role = USB_ROLE_NONE;
1076                 } else {
1077                         return -ENOTSUPP;
1078                 }
1079         }
1080
1081         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1082         if (ret < 0)
1083                 return ret;
1084
1085         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1086         if (ret < 0)
1087                 return ret;
1088
1089         port->pwr_role = role;
1090         port->data_role = data;
1091         typec_set_data_role(port->typec_port, data);
1092         typec_set_pwr_role(port->typec_port, role);
1093
1094         return 0;
1095 }
1096
1097 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1098 {
1099         int ret;
1100
1101         ret = port->tcpc->set_roles(port->tcpc, true, role,
1102                                     port->data_role);
1103         if (ret < 0)
1104                 return ret;
1105
1106         port->pwr_role = role;
1107         typec_set_pwr_role(port->typec_port, role);
1108
1109         return 0;
1110 }
1111
1112 /*
1113  * Transform the PDO to be compliant to PD rev2.0.
1114  * Return 0 if the PDO type is not defined in PD rev2.0.
1115  * Otherwise, return the converted PDO.
1116  */
1117 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1118 {
1119         switch (pdo_type(pdo)) {
1120         case PDO_TYPE_FIXED:
1121                 if (role == TYPEC_SINK)
1122                         return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1123                 else
1124                         return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1125         case PDO_TYPE_VAR:
1126         case PDO_TYPE_BATT:
1127                 return pdo;
1128         case PDO_TYPE_APDO:
1129         default:
1130                 return 0;
1131         }
1132 }
1133
1134 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1135 {
1136         struct pd_message msg;
1137         u32 pdo;
1138         unsigned int i, nr_pdo = 0;
1139
1140         memset(&msg, 0, sizeof(msg));
1141
1142         for (i = 0; i < port->nr_src_pdo; i++) {
1143                 if (port->negotiated_rev >= PD_REV30) {
1144                         msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
1145                 } else {
1146                         pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1147                         if (pdo)
1148                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1149                 }
1150         }
1151
1152         if (!nr_pdo) {
1153                 /* No source capabilities defined, sink only */
1154                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1155                                           port->pwr_role,
1156                                           port->data_role,
1157                                           port->negotiated_rev,
1158                                           port->message_id, 0);
1159         } else {
1160                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1161                                           port->pwr_role,
1162                                           port->data_role,
1163                                           port->negotiated_rev,
1164                                           port->message_id,
1165                                           nr_pdo);
1166         }
1167
1168         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1169 }
1170
1171 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1172 {
1173         struct pd_message msg;
1174         u32 pdo;
1175         unsigned int i, nr_pdo = 0;
1176
1177         memset(&msg, 0, sizeof(msg));
1178
1179         for (i = 0; i < port->nr_snk_pdo; i++) {
1180                 if (port->negotiated_rev >= PD_REV30) {
1181                         msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
1182                 } else {
1183                         pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1184                         if (pdo)
1185                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1186                 }
1187         }
1188
1189         if (!nr_pdo) {
1190                 /* No sink capabilities defined, source only */
1191                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1192                                           port->pwr_role,
1193                                           port->data_role,
1194                                           port->negotiated_rev,
1195                                           port->message_id, 0);
1196         } else {
1197                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1198                                           port->pwr_role,
1199                                           port->data_role,
1200                                           port->negotiated_rev,
1201                                           port->message_id,
1202                                           nr_pdo);
1203         }
1204
1205         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1206 }
1207
1208 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1209 {
1210         if (delay_ms) {
1211                 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1212         } else {
1213                 hrtimer_cancel(&port->state_machine_timer);
1214                 kthread_queue_work(port->wq, &port->state_machine);
1215         }
1216 }
1217
1218 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1219 {
1220         if (delay_ms) {
1221                 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1222                               HRTIMER_MODE_REL);
1223         } else {
1224                 hrtimer_cancel(&port->vdm_state_machine_timer);
1225                 kthread_queue_work(port->wq, &port->vdm_state_machine);
1226         }
1227 }
1228
1229 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1230 {
1231         if (delay_ms) {
1232                 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1233         } else {
1234                 hrtimer_cancel(&port->enable_frs_timer);
1235                 kthread_queue_work(port->wq, &port->enable_frs);
1236         }
1237 }
1238
1239 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1240 {
1241         if (delay_ms) {
1242                 hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1243         } else {
1244                 hrtimer_cancel(&port->send_discover_timer);
1245                 kthread_queue_work(port->wq, &port->send_discover_work);
1246         }
1247 }
1248
1249 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1250                            unsigned int delay_ms)
1251 {
1252         if (delay_ms) {
1253                 tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1254                          tcpm_states[port->state], tcpm_states[state], delay_ms,
1255                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1256                 port->delayed_state = state;
1257                 mod_tcpm_delayed_work(port, delay_ms);
1258                 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1259                 port->delay_ms = delay_ms;
1260         } else {
1261                 tcpm_log(port, "state change %s -> %s [%s %s]",
1262                          tcpm_states[port->state], tcpm_states[state],
1263                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1264                 port->delayed_state = INVALID_STATE;
1265                 port->prev_state = port->state;
1266                 port->state = state;
1267                 /*
1268                  * Don't re-queue the state machine work item if we're currently
1269                  * in the state machine and we're immediately changing states.
1270                  * tcpm_state_machine_work() will continue running the state
1271                  * machine.
1272                  */
1273                 if (!port->state_machine_running)
1274                         mod_tcpm_delayed_work(port, 0);
1275         }
1276 }
1277
1278 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1279                                 unsigned int delay_ms)
1280 {
1281         if (port->enter_state == port->state)
1282                 tcpm_set_state(port, state, delay_ms);
1283         else
1284                 tcpm_log(port,
1285                          "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1286                          delay_ms ? "delayed " : "",
1287                          tcpm_states[port->state], tcpm_states[state],
1288                          delay_ms, tcpm_states[port->enter_state],
1289                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1290 }
1291
1292 static void tcpm_queue_message(struct tcpm_port *port,
1293                                enum pd_msg_request message)
1294 {
1295         port->queued_message = message;
1296         mod_tcpm_delayed_work(port, 0);
1297 }
1298
1299 static bool tcpm_vdm_ams(struct tcpm_port *port)
1300 {
1301         switch (port->ams) {
1302         case DISCOVER_IDENTITY:
1303         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1304         case DISCOVER_SVIDS:
1305         case DISCOVER_MODES:
1306         case DFP_TO_UFP_ENTER_MODE:
1307         case DFP_TO_UFP_EXIT_MODE:
1308         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1309         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1310         case ATTENTION:
1311         case UNSTRUCTURED_VDMS:
1312         case STRUCTURED_VDMS:
1313                 break;
1314         default:
1315                 return false;
1316         }
1317
1318         return true;
1319 }
1320
1321 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1322 {
1323         switch (port->ams) {
1324         /* Interruptible AMS */
1325         case NONE_AMS:
1326         case SECURITY:
1327         case FIRMWARE_UPDATE:
1328         case DISCOVER_IDENTITY:
1329         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1330         case DISCOVER_SVIDS:
1331         case DISCOVER_MODES:
1332         case DFP_TO_UFP_ENTER_MODE:
1333         case DFP_TO_UFP_EXIT_MODE:
1334         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1335         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1336         case UNSTRUCTURED_VDMS:
1337         case STRUCTURED_VDMS:
1338         case COUNTRY_INFO:
1339         case COUNTRY_CODES:
1340                 break;
1341         /* Non-Interruptible AMS */
1342         default:
1343                 if (port->in_ams)
1344                         return false;
1345                 break;
1346         }
1347
1348         return true;
1349 }
1350
1351 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1352 {
1353         int ret = 0;
1354
1355         tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1356
1357         if (!tcpm_ams_interruptible(port) &&
1358             !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1359                 port->upcoming_state = INVALID_STATE;
1360                 tcpm_log(port, "AMS %s not interruptible, aborting",
1361                          tcpm_ams_str[port->ams]);
1362                 return -EAGAIN;
1363         }
1364
1365         if (port->pwr_role == TYPEC_SOURCE) {
1366                 enum typec_cc_status cc_req = port->cc_req;
1367
1368                 port->ams = ams;
1369
1370                 if (ams == HARD_RESET) {
1371                         tcpm_set_cc(port, tcpm_rp_cc(port));
1372                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1373                         tcpm_set_state(port, HARD_RESET_START, 0);
1374                         return ret;
1375                 } else if (ams == SOFT_RESET_AMS) {
1376                         if (!port->explicit_contract)
1377                                 tcpm_set_cc(port, tcpm_rp_cc(port));
1378                         tcpm_set_state(port, SOFT_RESET_SEND, 0);
1379                         return ret;
1380                 } else if (tcpm_vdm_ams(port)) {
1381                         /* tSinkTx is enforced in vdm_run_state_machine */
1382                         if (port->negotiated_rev >= PD_REV30)
1383                                 tcpm_set_cc(port, SINK_TX_NG);
1384                         return ret;
1385                 }
1386
1387                 if (port->negotiated_rev >= PD_REV30)
1388                         tcpm_set_cc(port, SINK_TX_NG);
1389
1390                 switch (port->state) {
1391                 case SRC_READY:
1392                 case SRC_STARTUP:
1393                 case SRC_SOFT_RESET_WAIT_SNK_TX:
1394                 case SOFT_RESET:
1395                 case SOFT_RESET_SEND:
1396                         if (port->negotiated_rev >= PD_REV30)
1397                                 tcpm_set_state(port, AMS_START,
1398                                                cc_req == SINK_TX_OK ?
1399                                                PD_T_SINK_TX : 0);
1400                         else
1401                                 tcpm_set_state(port, AMS_START, 0);
1402                         break;
1403                 default:
1404                         if (port->negotiated_rev >= PD_REV30)
1405                                 tcpm_set_state(port, SRC_READY,
1406                                                cc_req == SINK_TX_OK ?
1407                                                PD_T_SINK_TX : 0);
1408                         else
1409                                 tcpm_set_state(port, SRC_READY, 0);
1410                         break;
1411                 }
1412         } else {
1413                 if (port->negotiated_rev >= PD_REV30 &&
1414                     !tcpm_sink_tx_ok(port) &&
1415                     ams != SOFT_RESET_AMS &&
1416                     ams != HARD_RESET) {
1417                         port->upcoming_state = INVALID_STATE;
1418                         tcpm_log(port, "Sink TX No Go");
1419                         return -EAGAIN;
1420                 }
1421
1422                 port->ams = ams;
1423
1424                 if (ams == HARD_RESET) {
1425                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1426                         tcpm_set_state(port, HARD_RESET_START, 0);
1427                         return ret;
1428                 } else if (tcpm_vdm_ams(port)) {
1429                         return ret;
1430                 }
1431
1432                 if (port->state == SNK_READY ||
1433                     port->state == SNK_SOFT_RESET)
1434                         tcpm_set_state(port, AMS_START, 0);
1435                 else
1436                         tcpm_set_state(port, SNK_READY, 0);
1437         }
1438
1439         return ret;
1440 }
1441
1442 /*
1443  * VDM/VDO handling functions
1444  */
1445 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1446                            const u32 *data, int cnt)
1447 {
1448         u32 vdo_hdr = port->vdo_data[0];
1449
1450         WARN_ON(!mutex_is_locked(&port->lock));
1451
1452         /* If is sending discover_identity, handle received message first */
1453         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMD(vdo_hdr) == CMD_DISCOVER_IDENT) {
1454                 port->send_discover = true;
1455                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
1456         } else {
1457                 /* Make sure we are not still processing a previous VDM packet */
1458                 WARN_ON(port->vdm_state > VDM_STATE_DONE);
1459         }
1460
1461         port->vdo_count = cnt + 1;
1462         port->vdo_data[0] = header;
1463         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1464         /* Set ready, vdm state machine will actually send */
1465         port->vdm_retries = 0;
1466         port->vdm_state = VDM_STATE_READY;
1467         port->vdm_sm_running = true;
1468
1469         mod_vdm_delayed_work(port, 0);
1470 }
1471
1472 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1473                                     const u32 *data, int cnt)
1474 {
1475         mutex_lock(&port->lock);
1476         tcpm_queue_vdm(port, header, data, cnt);
1477         mutex_unlock(&port->lock);
1478 }
1479
1480 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1481 {
1482         u32 vdo = p[VDO_INDEX_IDH];
1483         u32 product = p[VDO_INDEX_PRODUCT];
1484
1485         memset(&port->mode_data, 0, sizeof(port->mode_data));
1486
1487         port->partner_ident.id_header = vdo;
1488         port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1489         port->partner_ident.product = product;
1490
1491         typec_partner_set_identity(port->partner);
1492
1493         tcpm_log(port, "Identity: %04x:%04x.%04x",
1494                  PD_IDH_VID(vdo),
1495                  PD_PRODUCT_PID(product), product & 0xffff);
1496 }
1497
1498 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1499 {
1500         struct pd_mode_data *pmdata = &port->mode_data;
1501         int i;
1502
1503         for (i = 1; i < cnt; i++) {
1504                 u16 svid;
1505
1506                 svid = (p[i] >> 16) & 0xffff;
1507                 if (!svid)
1508                         return false;
1509
1510                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1511                         goto abort;
1512
1513                 pmdata->svids[pmdata->nsvids++] = svid;
1514                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1515
1516                 svid = p[i] & 0xffff;
1517                 if (!svid)
1518                         return false;
1519
1520                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1521                         goto abort;
1522
1523                 pmdata->svids[pmdata->nsvids++] = svid;
1524                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1525         }
1526
1527         /*
1528          * PD3.0 Spec 6.4.4.3.2: The SVIDs are returned 2 per VDO (see Table
1529          * 6-43), and can be returned maximum 6 VDOs per response (see Figure
1530          * 6-19). If the Respondersupports 12 or more SVID then the Discover
1531          * SVIDs Command Shall be executed multiple times until a Discover
1532          * SVIDs VDO is returned ending either with a SVID value of 0x0000 in
1533          * the last part of the last VDO or with a VDO containing two SVIDs
1534          * with values of 0x0000.
1535          *
1536          * However, some odd dockers support SVIDs less than 12 but without
1537          * 0x0000 in the last VDO, so we need to break the Discover SVIDs
1538          * request and return false here.
1539          */
1540         return cnt == 7;
1541 abort:
1542         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1543         return false;
1544 }
1545
1546 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1547 {
1548         struct pd_mode_data *pmdata = &port->mode_data;
1549         struct typec_altmode_desc *paltmode;
1550         int i;
1551
1552         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1553                 /* Already logged in svdm_consume_svids() */
1554                 return;
1555         }
1556
1557         for (i = 1; i < cnt; i++) {
1558                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1559                 memset(paltmode, 0, sizeof(*paltmode));
1560
1561                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1562                 paltmode->mode = i;
1563                 paltmode->vdo = p[i];
1564
1565                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1566                          pmdata->altmodes, paltmode->svid,
1567                          paltmode->mode, paltmode->vdo);
1568
1569                 pmdata->altmodes++;
1570         }
1571 }
1572
1573 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1574 {
1575         struct pd_mode_data *modep = &port->mode_data;
1576         struct typec_altmode *altmode;
1577         int i;
1578
1579         for (i = 0; i < modep->altmodes; i++) {
1580                 altmode = typec_partner_register_altmode(port->partner,
1581                                                 &modep->altmode_desc[i]);
1582                 if (IS_ERR(altmode)) {
1583                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1584                                  modep->altmode_desc[i].svid);
1585                         altmode = NULL;
1586                 }
1587                 port->partner_altmode[i] = altmode;
1588         }
1589 }
1590
1591 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1592
1593 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1594                         const u32 *p, int cnt, u32 *response,
1595                         enum adev_actions *adev_action)
1596 {
1597         struct typec_port *typec = port->typec_port;
1598         struct typec_altmode *pdev;
1599         struct pd_mode_data *modep;
1600         int svdm_version;
1601         int rlen = 0;
1602         int cmd_type;
1603         int cmd;
1604         int i;
1605
1606         cmd_type = PD_VDO_CMDT(p[0]);
1607         cmd = PD_VDO_CMD(p[0]);
1608
1609         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1610                  p[0], cmd_type, cmd, cnt);
1611
1612         modep = &port->mode_data;
1613
1614         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1615                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1616
1617         svdm_version = typec_get_negotiated_svdm_version(typec);
1618         if (svdm_version < 0)
1619                 return 0;
1620
1621         switch (cmd_type) {
1622         case CMDT_INIT:
1623                 switch (cmd) {
1624                 case CMD_DISCOVER_IDENT:
1625                         if (PD_VDO_VID(p[0]) != USB_SID_PD)
1626                                 break;
1627
1628                         if (IS_ERR_OR_NULL(port->partner))
1629                                 break;
1630
1631                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1632                                 typec_partner_set_svdm_version(port->partner,
1633                                                                PD_VDO_SVDM_VER(p[0]));
1634                                 svdm_version = PD_VDO_SVDM_VER(p[0]);
1635                         }
1636
1637                         port->ams = DISCOVER_IDENTITY;
1638                         /*
1639                          * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1640                          * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1641                          * "wrong configuation" or "Unrecognized"
1642                          */
1643                         if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1644                             port->nr_snk_vdo) {
1645                                 if (svdm_version < SVDM_VER_2_0) {
1646                                         for (i = 0; i < port->nr_snk_vdo_v1; i++)
1647                                                 response[i + 1] = port->snk_vdo_v1[i];
1648                                         rlen = port->nr_snk_vdo_v1 + 1;
1649
1650                                 } else {
1651                                         for (i = 0; i < port->nr_snk_vdo; i++)
1652                                                 response[i + 1] = port->snk_vdo[i];
1653                                         rlen = port->nr_snk_vdo + 1;
1654                                 }
1655                         }
1656                         break;
1657                 case CMD_DISCOVER_SVID:
1658                         port->ams = DISCOVER_SVIDS;
1659                         break;
1660                 case CMD_DISCOVER_MODES:
1661                         port->ams = DISCOVER_MODES;
1662                         break;
1663                 case CMD_ENTER_MODE:
1664                         port->ams = DFP_TO_UFP_ENTER_MODE;
1665                         break;
1666                 case CMD_EXIT_MODE:
1667                         port->ams = DFP_TO_UFP_EXIT_MODE;
1668                         break;
1669                 case CMD_ATTENTION:
1670                         /* Attention command does not have response */
1671                         *adev_action = ADEV_ATTENTION;
1672                         return 0;
1673                 default:
1674                         break;
1675                 }
1676                 if (rlen >= 1) {
1677                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1678                 } else if (rlen == 0) {
1679                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1680                         rlen = 1;
1681                 } else {
1682                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1683                         rlen = 1;
1684                 }
1685                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1686                               (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1687                 break;
1688         case CMDT_RSP_ACK:
1689                 /* silently drop message if we are not connected */
1690                 if (IS_ERR_OR_NULL(port->partner))
1691                         break;
1692
1693                 tcpm_ams_finish(port);
1694
1695                 switch (cmd) {
1696                 case CMD_DISCOVER_IDENT:
1697                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1698                                 typec_partner_set_svdm_version(port->partner,
1699                                                                PD_VDO_SVDM_VER(p[0]));
1700                         /* 6.4.4.3.1 */
1701                         svdm_consume_identity(port, p, cnt);
1702                         response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1703                                           CMD_DISCOVER_SVID);
1704                         rlen = 1;
1705                         break;
1706                 case CMD_DISCOVER_SVID:
1707                         /* 6.4.4.3.2 */
1708                         if (svdm_consume_svids(port, p, cnt)) {
1709                                 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1710                                 rlen = 1;
1711                         } else if (modep->nsvids && supports_modal(port)) {
1712                                 response[0] = VDO(modep->svids[0], 1, svdm_version,
1713                                                   CMD_DISCOVER_MODES);
1714                                 rlen = 1;
1715                         }
1716                         break;
1717                 case CMD_DISCOVER_MODES:
1718                         /* 6.4.4.3.3 */
1719                         svdm_consume_modes(port, p, cnt);
1720                         modep->svid_index++;
1721                         if (modep->svid_index < modep->nsvids) {
1722                                 u16 svid = modep->svids[modep->svid_index];
1723                                 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1724                                 rlen = 1;
1725                         } else {
1726                                 tcpm_register_partner_altmodes(port);
1727                         }
1728                         break;
1729                 case CMD_ENTER_MODE:
1730                         if (adev && pdev)
1731                                 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1732                         return 0;
1733                 case CMD_EXIT_MODE:
1734                         if (adev && pdev) {
1735                                 /* Back to USB Operation */
1736                                 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1737                                 return 0;
1738                         }
1739                         break;
1740                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1741                         break;
1742                 default:
1743                         /* Unrecognized SVDM */
1744                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1745                         rlen = 1;
1746                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1747                                       (VDO_SVDM_VERS(svdm_version));
1748                         break;
1749                 }
1750                 break;
1751         case CMDT_RSP_NAK:
1752                 tcpm_ams_finish(port);
1753                 switch (cmd) {
1754                 case CMD_DISCOVER_IDENT:
1755                 case CMD_DISCOVER_SVID:
1756                 case CMD_DISCOVER_MODES:
1757                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1758                         break;
1759                 case CMD_ENTER_MODE:
1760                         /* Back to USB Operation */
1761                         *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1762                         return 0;
1763                 default:
1764                         /* Unrecognized SVDM */
1765                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1766                         rlen = 1;
1767                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1768                                       (VDO_SVDM_VERS(svdm_version));
1769                         break;
1770                 }
1771                 break;
1772         default:
1773                 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1774                 rlen = 1;
1775                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1776                               (VDO_SVDM_VERS(svdm_version));
1777                 break;
1778         }
1779
1780         /* Informing the alternate mode drivers about everything */
1781         *adev_action = ADEV_QUEUE_VDM;
1782         return rlen;
1783 }
1784
1785 static void tcpm_pd_handle_msg(struct tcpm_port *port,
1786                                enum pd_msg_request message,
1787                                enum tcpm_ams ams);
1788
1789 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1790                                     const __le32 *payload, int cnt)
1791 {
1792         enum adev_actions adev_action = ADEV_NONE;
1793         struct typec_altmode *adev;
1794         u32 p[PD_MAX_PAYLOAD];
1795         u32 response[8] = { };
1796         int i, rlen = 0;
1797
1798         for (i = 0; i < cnt; i++)
1799                 p[i] = le32_to_cpu(payload[i]);
1800
1801         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1802                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1803
1804         if (port->vdm_state == VDM_STATE_BUSY) {
1805                 /* If UFP responded busy retry after timeout */
1806                 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1807                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1808                         port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1809                                 CMDT_INIT;
1810                         mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1811                         return;
1812                 }
1813                 port->vdm_state = VDM_STATE_DONE;
1814         }
1815
1816         if (PD_VDO_SVDM(p[0]) && (adev || tcpm_vdm_ams(port) || port->nr_snk_vdo)) {
1817                 /*
1818                  * Here a SVDM is received (INIT or RSP or unknown). Set the vdm_sm_running in
1819                  * advance because we are dropping the lock but may send VDMs soon.
1820                  * For the cases of INIT received:
1821                  *  - If no response to send, it will be cleared later in this function.
1822                  *  - If there are responses to send, it will be cleared in the state machine.
1823                  * For the cases of RSP received:
1824                  *  - If no further INIT to send, it will be cleared later in this function.
1825                  *  - Otherwise, it will be cleared in the state machine if timeout or it will go
1826                  *    back here until no further INIT to send.
1827                  * For the cases of unknown type received:
1828                  *  - We will send NAK and the flag will be cleared in the state machine.
1829                  */
1830                 port->vdm_sm_running = true;
1831                 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1832         } else {
1833                 if (port->negotiated_rev >= PD_REV30)
1834                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
1835         }
1836
1837         /*
1838          * We are done with any state stored in the port struct now, except
1839          * for any port struct changes done by the tcpm_queue_vdm() call
1840          * below, which is a separate operation.
1841          *
1842          * So we can safely release the lock here; and we MUST release the
1843          * lock here to avoid an AB BA lock inversion:
1844          *
1845          * If we keep the lock here then the lock ordering in this path is:
1846          * 1. tcpm_pd_rx_handler take the tcpm port lock
1847          * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1848          *
1849          * And we also have this ordering:
1850          * 1. alt-mode driver takes the alt-mode's lock
1851          * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1852          *    tcpm port lock
1853          *
1854          * Dropping our lock here avoids this.
1855          */
1856         mutex_unlock(&port->lock);
1857
1858         if (adev) {
1859                 switch (adev_action) {
1860                 case ADEV_NONE:
1861                         break;
1862                 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1863                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1864                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1865                         break;
1866                 case ADEV_QUEUE_VDM:
1867                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1868                         break;
1869                 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1870                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1871                                 int svdm_version = typec_get_negotiated_svdm_version(
1872                                                                         port->typec_port);
1873                                 if (svdm_version < 0)
1874                                         break;
1875
1876                                 response[0] = VDO(adev->svid, 1, svdm_version,
1877                                                   CMD_EXIT_MODE);
1878                                 response[0] |= VDO_OPOS(adev->mode);
1879                                 rlen = 1;
1880                         }
1881                         break;
1882                 case ADEV_ATTENTION:
1883                         if (typec_altmode_attention(adev, p[1]))
1884                                 tcpm_log(port, "typec_altmode_attention no port partner altmode");
1885                         break;
1886                 }
1887         }
1888
1889         /*
1890          * We must re-take the lock here to balance the unlock in
1891          * tcpm_pd_rx_handler, note that no changes, other then the
1892          * tcpm_queue_vdm call, are made while the lock is held again.
1893          * All that is done after the call is unwinding the call stack until
1894          * we return to tcpm_pd_rx_handler and do the unlock there.
1895          */
1896         mutex_lock(&port->lock);
1897
1898         if (rlen > 0)
1899                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1900         else
1901                 port->vdm_sm_running = false;
1902 }
1903
1904 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1905                           const u32 *data, int count)
1906 {
1907         int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1908         u32 header;
1909
1910         if (svdm_version < 0)
1911                 return;
1912
1913         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1914                 count = VDO_MAX_SIZE - 1;
1915
1916         /* set VDM header with VID & CMD */
1917         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1918                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1919                         svdm_version, cmd);
1920         tcpm_queue_vdm(port, header, data, count);
1921 }
1922
1923 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1924 {
1925         unsigned int timeout;
1926         int cmd = PD_VDO_CMD(vdm_hdr);
1927
1928         /* its not a structured VDM command */
1929         if (!PD_VDO_SVDM(vdm_hdr))
1930                 return PD_T_VDM_UNSTRUCTURED;
1931
1932         switch (PD_VDO_CMDT(vdm_hdr)) {
1933         case CMDT_INIT:
1934                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1935                         timeout = PD_T_VDM_WAIT_MODE_E;
1936                 else
1937                         timeout = PD_T_VDM_SNDR_RSP;
1938                 break;
1939         default:
1940                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1941                         timeout = PD_T_VDM_E_MODE;
1942                 else
1943                         timeout = PD_T_VDM_RCVR_RSP;
1944                 break;
1945         }
1946         return timeout;
1947 }
1948
1949 static void vdm_run_state_machine(struct tcpm_port *port)
1950 {
1951         struct pd_message msg;
1952         int i, res = 0;
1953         u32 vdo_hdr = port->vdo_data[0];
1954
1955         switch (port->vdm_state) {
1956         case VDM_STATE_READY:
1957                 /* Only transmit VDM if attached */
1958                 if (!port->attached) {
1959                         port->vdm_state = VDM_STATE_ERR_BUSY;
1960                         break;
1961                 }
1962
1963                 /*
1964                  * if there's traffic or we're not in PDO ready state don't send
1965                  * a VDM.
1966                  */
1967                 if (port->state != SRC_READY && port->state != SNK_READY) {
1968                         port->vdm_sm_running = false;
1969                         break;
1970                 }
1971
1972                 /* TODO: AMS operation for Unstructured VDM */
1973                 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1974                         switch (PD_VDO_CMD(vdo_hdr)) {
1975                         case CMD_DISCOVER_IDENT:
1976                                 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1977                                 if (res == 0) {
1978                                         port->send_discover = false;
1979                                 } else if (res == -EAGAIN) {
1980                                         port->vdo_data[0] = 0;
1981                                         mod_send_discover_delayed_work(port,
1982                                                                        SEND_DISCOVER_RETRY_MS);
1983                                 }
1984                                 break;
1985                         case CMD_DISCOVER_SVID:
1986                                 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1987                                 break;
1988                         case CMD_DISCOVER_MODES:
1989                                 res = tcpm_ams_start(port, DISCOVER_MODES);
1990                                 break;
1991                         case CMD_ENTER_MODE:
1992                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1993                                 break;
1994                         case CMD_EXIT_MODE:
1995                                 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1996                                 break;
1997                         case CMD_ATTENTION:
1998                                 res = tcpm_ams_start(port, ATTENTION);
1999                                 break;
2000                         case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
2001                                 res = tcpm_ams_start(port, STRUCTURED_VDMS);
2002                                 break;
2003                         default:
2004                                 res = -EOPNOTSUPP;
2005                                 break;
2006                         }
2007
2008                         if (res < 0) {
2009                                 port->vdm_state = VDM_STATE_ERR_BUSY;
2010                                 return;
2011                         }
2012                 }
2013
2014                 port->vdm_state = VDM_STATE_SEND_MESSAGE;
2015                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
2016                                             port->pwr_role == TYPEC_SOURCE &&
2017                                             PD_VDO_SVDM(vdo_hdr) &&
2018                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
2019                                            PD_T_SINK_TX : 0);
2020                 break;
2021         case VDM_STATE_WAIT_RSP_BUSY:
2022                 port->vdo_data[0] = port->vdo_retry;
2023                 port->vdo_count = 1;
2024                 port->vdm_state = VDM_STATE_READY;
2025                 tcpm_ams_finish(port);
2026                 break;
2027         case VDM_STATE_BUSY:
2028                 port->vdm_state = VDM_STATE_ERR_TMOUT;
2029                 if (port->ams != NONE_AMS)
2030                         tcpm_ams_finish(port);
2031                 break;
2032         case VDM_STATE_ERR_SEND:
2033                 /*
2034                  * A partner which does not support USB PD will not reply,
2035                  * so this is not a fatal error. At the same time, some
2036                  * devices may not return GoodCRC under some circumstances,
2037                  * so we need to retry.
2038                  */
2039                 if (port->vdm_retries < 3) {
2040                         tcpm_log(port, "VDM Tx error, retry");
2041                         port->vdm_retries++;
2042                         port->vdm_state = VDM_STATE_READY;
2043                         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
2044                                 tcpm_ams_finish(port);
2045                 } else {
2046                         tcpm_ams_finish(port);
2047                 }
2048                 break;
2049         case VDM_STATE_SEND_MESSAGE:
2050                 /* Prepare and send VDM */
2051                 memset(&msg, 0, sizeof(msg));
2052                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
2053                                           port->pwr_role,
2054                                           port->data_role,
2055                                           port->negotiated_rev,
2056                                           port->message_id, port->vdo_count);
2057                 for (i = 0; i < port->vdo_count; i++)
2058                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
2059                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2060                 if (res < 0) {
2061                         port->vdm_state = VDM_STATE_ERR_SEND;
2062                 } else {
2063                         unsigned long timeout;
2064
2065                         port->vdm_retries = 0;
2066                         port->vdo_data[0] = 0;
2067                         port->vdm_state = VDM_STATE_BUSY;
2068                         timeout = vdm_ready_timeout(vdo_hdr);
2069                         mod_vdm_delayed_work(port, timeout);
2070                 }
2071                 break;
2072         default:
2073                 break;
2074         }
2075 }
2076
2077 static void vdm_state_machine_work(struct kthread_work *work)
2078 {
2079         struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2080         enum vdm_states prev_state;
2081
2082         mutex_lock(&port->lock);
2083
2084         /*
2085          * Continue running as long as the port is not busy and there was
2086          * a state change.
2087          */
2088         do {
2089                 prev_state = port->vdm_state;
2090                 vdm_run_state_machine(port);
2091         } while (port->vdm_state != prev_state &&
2092                  port->vdm_state != VDM_STATE_BUSY &&
2093                  port->vdm_state != VDM_STATE_SEND_MESSAGE);
2094
2095         if (port->vdm_state < VDM_STATE_READY)
2096                 port->vdm_sm_running = false;
2097
2098         mutex_unlock(&port->lock);
2099 }
2100
2101 enum pdo_err {
2102         PDO_NO_ERR,
2103         PDO_ERR_NO_VSAFE5V,
2104         PDO_ERR_VSAFE5V_NOT_FIRST,
2105         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2106         PDO_ERR_FIXED_NOT_SORTED,
2107         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2108         PDO_ERR_DUPE_PDO,
2109         PDO_ERR_PPS_APDO_NOT_SORTED,
2110         PDO_ERR_DUPE_PPS_APDO,
2111 };
2112
2113 static const char * const pdo_err_msg[] = {
2114         [PDO_ERR_NO_VSAFE5V] =
2115         " err: source/sink caps should at least have vSafe5V",
2116         [PDO_ERR_VSAFE5V_NOT_FIRST] =
2117         " err: vSafe5V Fixed Supply Object Shall always be the first object",
2118         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2119         " err: PDOs should be in the following order: Fixed; Battery; Variable",
2120         [PDO_ERR_FIXED_NOT_SORTED] =
2121         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2122         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2123         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2124         [PDO_ERR_DUPE_PDO] =
2125         " err: Variable/Batt supply pdos cannot have same min/max voltage",
2126         [PDO_ERR_PPS_APDO_NOT_SORTED] =
2127         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2128         [PDO_ERR_DUPE_PPS_APDO] =
2129         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2130 };
2131
2132 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2133                                   unsigned int nr_pdo)
2134 {
2135         unsigned int i;
2136
2137         /* Should at least contain vSafe5v */
2138         if (nr_pdo < 1)
2139                 return PDO_ERR_NO_VSAFE5V;
2140
2141         /* The vSafe5V Fixed Supply Object Shall always be the first object */
2142         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2143             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2144                 return PDO_ERR_VSAFE5V_NOT_FIRST;
2145
2146         for (i = 1; i < nr_pdo; i++) {
2147                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2148                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2149                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2150                         enum pd_pdo_type type = pdo_type(pdo[i]);
2151
2152                         switch (type) {
2153                         /*
2154                          * The remaining Fixed Supply Objects, if
2155                          * present, shall be sent in voltage order;
2156                          * lowest to highest.
2157                          */
2158                         case PDO_TYPE_FIXED:
2159                                 if (pdo_fixed_voltage(pdo[i]) <=
2160                                     pdo_fixed_voltage(pdo[i - 1]))
2161                                         return PDO_ERR_FIXED_NOT_SORTED;
2162                                 break;
2163                         /*
2164                          * The Battery Supply Objects and Variable
2165                          * supply, if present shall be sent in Minimum
2166                          * Voltage order; lowest to highest.
2167                          */
2168                         case PDO_TYPE_VAR:
2169                         case PDO_TYPE_BATT:
2170                                 if (pdo_min_voltage(pdo[i]) <
2171                                     pdo_min_voltage(pdo[i - 1]))
2172                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2173                                 else if ((pdo_min_voltage(pdo[i]) ==
2174                                           pdo_min_voltage(pdo[i - 1])) &&
2175                                          (pdo_max_voltage(pdo[i]) ==
2176                                           pdo_max_voltage(pdo[i - 1])))
2177                                         return PDO_ERR_DUPE_PDO;
2178                                 break;
2179                         /*
2180                          * The Programmable Power Supply APDOs, if present,
2181                          * shall be sent in Maximum Voltage order;
2182                          * lowest to highest.
2183                          */
2184                         case PDO_TYPE_APDO:
2185                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2186                                         break;
2187
2188                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2189                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
2190                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
2191                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2192                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2193                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
2194                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2195                                          pdo_pps_apdo_max_current(pdo[i]) ==
2196                                           pdo_pps_apdo_max_current(pdo[i - 1]))
2197                                         return PDO_ERR_DUPE_PPS_APDO;
2198                                 break;
2199                         default:
2200                                 tcpm_log_force(port, " Unknown pdo type");
2201                         }
2202                 }
2203         }
2204
2205         return PDO_NO_ERR;
2206 }
2207
2208 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2209                               unsigned int nr_pdo)
2210 {
2211         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2212
2213         if (err_index != PDO_NO_ERR) {
2214                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2215                 return -EINVAL;
2216         }
2217
2218         return 0;
2219 }
2220
2221 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2222 {
2223         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2224         int svdm_version;
2225         u32 header;
2226
2227         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2228         if (svdm_version < 0)
2229                 return svdm_version;
2230
2231         header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2232         header |= VDO_OPOS(altmode->mode);
2233
2234         tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2235         return 0;
2236 }
2237
2238 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2239 {
2240         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2241         int svdm_version;
2242         u32 header;
2243
2244         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2245         if (svdm_version < 0)
2246                 return svdm_version;
2247
2248         header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2249         header |= VDO_OPOS(altmode->mode);
2250
2251         tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2252         return 0;
2253 }
2254
2255 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2256                             u32 header, const u32 *data, int count)
2257 {
2258         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2259
2260         tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2261
2262         return 0;
2263 }
2264
2265 static const struct typec_altmode_ops tcpm_altmode_ops = {
2266         .enter = tcpm_altmode_enter,
2267         .exit = tcpm_altmode_exit,
2268         .vdm = tcpm_altmode_vdm,
2269 };
2270
2271 /*
2272  * PD (data, control) command handling functions
2273  */
2274 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2275 {
2276         if (port->pwr_role == TYPEC_SOURCE)
2277                 return SRC_READY;
2278         else
2279                 return SNK_READY;
2280 }
2281
2282 static int tcpm_pd_send_control(struct tcpm_port *port,
2283                                 enum pd_ctrl_msg_type type);
2284
2285 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2286                               int cnt)
2287 {
2288         u32 p0 = le32_to_cpu(payload[0]);
2289         unsigned int type = usb_pd_ado_type(p0);
2290
2291         if (!type) {
2292                 tcpm_log(port, "Alert message received with no type");
2293                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2294                 return;
2295         }
2296
2297         /* Just handling non-battery alerts for now */
2298         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2299                 if (port->pwr_role == TYPEC_SOURCE) {
2300                         port->upcoming_state = GET_STATUS_SEND;
2301                         tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2302                 } else {
2303                         /*
2304                          * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2305                          * SinkTxOk in time.
2306                          */
2307                         port->ams = GETTING_SOURCE_SINK_STATUS;
2308                         tcpm_set_state(port, GET_STATUS_SEND, 0);
2309                 }
2310         } else {
2311                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2312         }
2313 }
2314
2315 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2316                                                   enum typec_pwr_opmode mode, bool pps_active,
2317                                                   u32 requested_vbus_voltage)
2318 {
2319         int ret;
2320
2321         if (!port->tcpc->set_auto_vbus_discharge_threshold)
2322                 return 0;
2323
2324         ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2325                                                             requested_vbus_voltage);
2326         tcpm_log_force(port,
2327                        "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2328                        mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2329
2330         return ret;
2331 }
2332
2333 static void tcpm_pd_handle_state(struct tcpm_port *port,
2334                                  enum tcpm_state state,
2335                                  enum tcpm_ams ams,
2336                                  unsigned int delay_ms)
2337 {
2338         switch (port->state) {
2339         case SRC_READY:
2340         case SNK_READY:
2341                 port->ams = ams;
2342                 tcpm_set_state(port, state, delay_ms);
2343                 break;
2344         /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2345         case SNK_TRANSITION_SINK:
2346         case SNK_TRANSITION_SINK_VBUS:
2347         case SRC_TRANSITION_SUPPLY:
2348                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2349                 break;
2350         default:
2351                 if (!tcpm_ams_interruptible(port)) {
2352                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2353                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2354                                        SNK_SOFT_RESET,
2355                                        0);
2356                 } else {
2357                         /* process the Message 6.8.1 */
2358                         port->upcoming_state = state;
2359                         port->next_ams = ams;
2360                         tcpm_set_state(port, ready_state(port), delay_ms);
2361                 }
2362                 break;
2363         }
2364 }
2365
2366 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2367                                enum pd_msg_request message,
2368                                enum tcpm_ams ams)
2369 {
2370         switch (port->state) {
2371         case SRC_READY:
2372         case SNK_READY:
2373                 port->ams = ams;
2374                 tcpm_queue_message(port, message);
2375                 break;
2376         /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2377         case SNK_TRANSITION_SINK:
2378         case SNK_TRANSITION_SINK_VBUS:
2379         case SRC_TRANSITION_SUPPLY:
2380                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2381                 break;
2382         default:
2383                 if (!tcpm_ams_interruptible(port)) {
2384                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2385                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2386                                        SNK_SOFT_RESET,
2387                                        0);
2388                 } else {
2389                         port->next_ams = ams;
2390                         tcpm_set_state(port, ready_state(port), 0);
2391                         /* 6.8.1 process the Message */
2392                         tcpm_queue_message(port, message);
2393                 }
2394                 break;
2395         }
2396 }
2397
2398 static int tcpm_register_source_caps(struct tcpm_port *port)
2399 {
2400         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2401         struct usb_power_delivery_capabilities_desc caps = { };
2402         struct usb_power_delivery_capabilities *cap;
2403
2404         if (!port->partner_pd)
2405                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2406         if (IS_ERR(port->partner_pd))
2407                 return PTR_ERR(port->partner_pd);
2408
2409         memcpy(caps.pdo, port->source_caps, sizeof(u32) * port->nr_source_caps);
2410         caps.role = TYPEC_SOURCE;
2411
2412         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2413         if (IS_ERR(cap))
2414                 return PTR_ERR(cap);
2415
2416         port->partner_source_caps = cap;
2417
2418         return 0;
2419 }
2420
2421 static int tcpm_register_sink_caps(struct tcpm_port *port)
2422 {
2423         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2424         struct usb_power_delivery_capabilities_desc caps = { };
2425         struct usb_power_delivery_capabilities *cap;
2426
2427         if (!port->partner_pd)
2428                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2429         if (IS_ERR(port->partner_pd))
2430                 return PTR_ERR(port->partner_pd);
2431
2432         memcpy(caps.pdo, port->sink_caps, sizeof(u32) * port->nr_sink_caps);
2433         caps.role = TYPEC_SINK;
2434
2435         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2436         if (IS_ERR(cap))
2437                 return PTR_ERR(cap);
2438
2439         port->partner_sink_caps = cap;
2440
2441         return 0;
2442 }
2443
2444 static void tcpm_pd_data_request(struct tcpm_port *port,
2445                                  const struct pd_message *msg)
2446 {
2447         enum pd_data_msg_type type = pd_header_type_le(msg->header);
2448         unsigned int cnt = pd_header_cnt_le(msg->header);
2449         unsigned int rev = pd_header_rev_le(msg->header);
2450         unsigned int i;
2451         enum frs_typec_current partner_frs_current;
2452         bool frs_enable;
2453         int ret;
2454
2455         if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2456                 port->vdm_state = VDM_STATE_ERR_BUSY;
2457                 tcpm_ams_finish(port);
2458                 mod_vdm_delayed_work(port, 0);
2459         }
2460
2461         switch (type) {
2462         case PD_DATA_SOURCE_CAP:
2463                 for (i = 0; i < cnt; i++)
2464                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2465
2466                 port->nr_source_caps = cnt;
2467
2468                 tcpm_log_source_caps(port);
2469
2470                 tcpm_validate_caps(port, port->source_caps,
2471                                    port->nr_source_caps);
2472
2473                 tcpm_register_source_caps(port);
2474
2475                 /*
2476                  * Adjust revision in subsequent message headers, as required,
2477                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2478                  * support Rev 1.0 so just do nothing in that scenario.
2479                  */
2480                 if (rev == PD_REV10) {
2481                         if (port->ams == GET_SOURCE_CAPABILITIES)
2482                                 tcpm_ams_finish(port);
2483                         break;
2484                 }
2485
2486                 if (rev < PD_MAX_REV)
2487                         port->negotiated_rev = rev;
2488
2489                 if (port->pwr_role == TYPEC_SOURCE) {
2490                         if (port->ams == GET_SOURCE_CAPABILITIES)
2491                                 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2492                         /* Unexpected Source Capabilities */
2493                         else
2494                                 tcpm_pd_handle_msg(port,
2495                                                    port->negotiated_rev < PD_REV30 ?
2496                                                    PD_MSG_CTRL_REJECT :
2497                                                    PD_MSG_CTRL_NOT_SUPP,
2498                                                    NONE_AMS);
2499                 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2500                 /*
2501                  * This message may be received even if VBUS is not
2502                  * present. This is quite unexpected; see USB PD
2503                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2504                  * However, at the same time, we must be ready to
2505                  * receive this message and respond to it 15ms after
2506                  * receiving PS_RDY during power swap operations, no matter
2507                  * if VBUS is available or not (USB PD specification,
2508                  * section 6.5.9.2).
2509                  * So we need to accept the message either way,
2510                  * but be prepared to keep waiting for VBUS after it was
2511                  * handled.
2512                  */
2513                         port->ams = POWER_NEGOTIATION;
2514                         port->in_ams = true;
2515                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2516                 } else {
2517                         if (port->ams == GET_SOURCE_CAPABILITIES)
2518                                 tcpm_ams_finish(port);
2519                         tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2520                                              POWER_NEGOTIATION, 0);
2521                 }
2522                 break;
2523         case PD_DATA_REQUEST:
2524                 /*
2525                  * Adjust revision in subsequent message headers, as required,
2526                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2527                  * support Rev 1.0 so just reject in that scenario.
2528                  */
2529                 if (rev == PD_REV10) {
2530                         tcpm_pd_handle_msg(port,
2531                                            port->negotiated_rev < PD_REV30 ?
2532                                            PD_MSG_CTRL_REJECT :
2533                                            PD_MSG_CTRL_NOT_SUPP,
2534                                            NONE_AMS);
2535                         break;
2536                 }
2537
2538                 if (rev < PD_MAX_REV)
2539                         port->negotiated_rev = rev;
2540
2541                 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2542                         tcpm_pd_handle_msg(port,
2543                                            port->negotiated_rev < PD_REV30 ?
2544                                            PD_MSG_CTRL_REJECT :
2545                                            PD_MSG_CTRL_NOT_SUPP,
2546                                            NONE_AMS);
2547                         break;
2548                 }
2549
2550                 port->sink_request = le32_to_cpu(msg->payload[0]);
2551
2552                 if (port->vdm_sm_running && port->explicit_contract) {
2553                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2554                         break;
2555                 }
2556
2557                 if (port->state == SRC_SEND_CAPABILITIES)
2558                         tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2559                 else
2560                         tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2561                                              POWER_NEGOTIATION, 0);
2562                 break;
2563         case PD_DATA_SINK_CAP:
2564                 /* We don't do anything with this at the moment... */
2565                 for (i = 0; i < cnt; i++)
2566                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2567
2568                 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2569                         PDO_FIXED_FRS_CURR_SHIFT;
2570                 frs_enable = partner_frs_current && (partner_frs_current <=
2571                                                      port->new_source_frs_current);
2572                 tcpm_log(port,
2573                          "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2574                          partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2575                 if (frs_enable) {
2576                         ret  = port->tcpc->enable_frs(port->tcpc, true);
2577                         tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2578                 }
2579
2580                 port->nr_sink_caps = cnt;
2581                 port->sink_cap_done = true;
2582                 tcpm_register_sink_caps(port);
2583
2584                 if (port->ams == GET_SINK_CAPABILITIES)
2585                         tcpm_set_state(port, ready_state(port), 0);
2586                 /* Unexpected Sink Capabilities */
2587                 else
2588                         tcpm_pd_handle_msg(port,
2589                                            port->negotiated_rev < PD_REV30 ?
2590                                            PD_MSG_CTRL_REJECT :
2591                                            PD_MSG_CTRL_NOT_SUPP,
2592                                            NONE_AMS);
2593                 break;
2594         case PD_DATA_VENDOR_DEF:
2595                 tcpm_handle_vdm_request(port, msg->payload, cnt);
2596                 break;
2597         case PD_DATA_BIST:
2598                 port->bist_request = le32_to_cpu(msg->payload[0]);
2599                 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2600                 break;
2601         case PD_DATA_ALERT:
2602                 if (port->state != SRC_READY && port->state != SNK_READY)
2603                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2604                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2605                                              NONE_AMS, 0);
2606                 else
2607                         tcpm_handle_alert(port, msg->payload, cnt);
2608                 break;
2609         case PD_DATA_BATT_STATUS:
2610         case PD_DATA_GET_COUNTRY_INFO:
2611                 /* Currently unsupported */
2612                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2613                                    PD_MSG_CTRL_REJECT :
2614                                    PD_MSG_CTRL_NOT_SUPP,
2615                                    NONE_AMS);
2616                 break;
2617         default:
2618                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2619                                    PD_MSG_CTRL_REJECT :
2620                                    PD_MSG_CTRL_NOT_SUPP,
2621                                    NONE_AMS);
2622                 tcpm_log(port, "Unrecognized data message type %#x", type);
2623                 break;
2624         }
2625 }
2626
2627 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2628 {
2629         if (port->pps_pending) {
2630                 port->pps_status = result;
2631                 port->pps_pending = false;
2632                 complete(&port->pps_complete);
2633         }
2634 }
2635
2636 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2637                                  const struct pd_message *msg)
2638 {
2639         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2640         enum tcpm_state next_state;
2641
2642         /*
2643          * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2644          * VDM AMS if waiting for VDM responses and will be handled later.
2645          */
2646         if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2647                 port->vdm_state = VDM_STATE_ERR_BUSY;
2648                 tcpm_ams_finish(port);
2649                 mod_vdm_delayed_work(port, 0);
2650         }
2651
2652         switch (type) {
2653         case PD_CTRL_GOOD_CRC:
2654         case PD_CTRL_PING:
2655                 break;
2656         case PD_CTRL_GET_SOURCE_CAP:
2657                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2658                 break;
2659         case PD_CTRL_GET_SINK_CAP:
2660                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2661                 break;
2662         case PD_CTRL_GOTO_MIN:
2663                 break;
2664         case PD_CTRL_PS_RDY:
2665                 switch (port->state) {
2666                 case SNK_TRANSITION_SINK:
2667                         if (port->vbus_present) {
2668                                 tcpm_set_current_limit(port,
2669                                                        port->req_current_limit,
2670                                                        port->req_supply_voltage);
2671                                 port->explicit_contract = true;
2672                                 tcpm_set_auto_vbus_discharge_threshold(port,
2673                                                                        TYPEC_PWR_MODE_PD,
2674                                                                        port->pps_data.active,
2675                                                                        port->supply_voltage);
2676                                 tcpm_set_state(port, SNK_READY, 0);
2677                         } else {
2678                                 /*
2679                                  * Seen after power swap. Keep waiting for VBUS
2680                                  * in a transitional state.
2681                                  */
2682                                 tcpm_set_state(port,
2683                                                SNK_TRANSITION_SINK_VBUS, 0);
2684                         }
2685                         break;
2686                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2687                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2688                         break;
2689                 case PR_SWAP_SNK_SRC_SINK_OFF:
2690                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2691                         break;
2692                 case VCONN_SWAP_WAIT_FOR_VCONN:
2693                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2694                         break;
2695                 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2696                         tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2697                         break;
2698                 default:
2699                         tcpm_pd_handle_state(port,
2700                                              port->pwr_role == TYPEC_SOURCE ?
2701                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2702                                              SNK_SOFT_RESET,
2703                                              NONE_AMS, 0);
2704                         break;
2705                 }
2706                 break;
2707         case PD_CTRL_REJECT:
2708         case PD_CTRL_WAIT:
2709         case PD_CTRL_NOT_SUPP:
2710                 switch (port->state) {
2711                 case SNK_NEGOTIATE_CAPABILITIES:
2712                         /* USB PD specification, Figure 8-43 */
2713                         if (port->explicit_contract)
2714                                 next_state = SNK_READY;
2715                         else
2716                                 next_state = SNK_WAIT_CAPABILITIES;
2717
2718                         /* Threshold was relaxed before sending Request. Restore it back. */
2719                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2720                                                                port->pps_data.active,
2721                                                                port->supply_voltage);
2722                         tcpm_set_state(port, next_state, 0);
2723                         break;
2724                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2725                         /* Revert data back from any requested PPS updates */
2726                         port->pps_data.req_out_volt = port->supply_voltage;
2727                         port->pps_data.req_op_curr = port->current_limit;
2728                         port->pps_status = (type == PD_CTRL_WAIT ?
2729                                             -EAGAIN : -EOPNOTSUPP);
2730
2731                         /* Threshold was relaxed before sending Request. Restore it back. */
2732                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2733                                                                port->pps_data.active,
2734                                                                port->supply_voltage);
2735
2736                         tcpm_set_state(port, SNK_READY, 0);
2737                         break;
2738                 case DR_SWAP_SEND:
2739                         port->swap_status = (type == PD_CTRL_WAIT ?
2740                                              -EAGAIN : -EOPNOTSUPP);
2741                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2742                         break;
2743                 case PR_SWAP_SEND:
2744                         port->swap_status = (type == PD_CTRL_WAIT ?
2745                                              -EAGAIN : -EOPNOTSUPP);
2746                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2747                         break;
2748                 case VCONN_SWAP_SEND:
2749                         port->swap_status = (type == PD_CTRL_WAIT ?
2750                                              -EAGAIN : -EOPNOTSUPP);
2751                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2752                         break;
2753                 case FR_SWAP_SEND:
2754                         tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2755                         break;
2756                 case GET_SINK_CAP:
2757                         port->sink_cap_done = true;
2758                         tcpm_set_state(port, ready_state(port), 0);
2759                         break;
2760                 /*
2761                  * Some port partners do not support GET_STATUS, avoid soft reset the link to
2762                  * prevent redundant power re-negotiation
2763                  */
2764                 case GET_STATUS_SEND:
2765                         tcpm_set_state(port, ready_state(port), 0);
2766                         break;
2767                 case SRC_READY:
2768                 case SNK_READY:
2769                         if (port->vdm_state > VDM_STATE_READY) {
2770                                 port->vdm_state = VDM_STATE_DONE;
2771                                 if (tcpm_vdm_ams(port))
2772                                         tcpm_ams_finish(port);
2773                                 mod_vdm_delayed_work(port, 0);
2774                                 break;
2775                         }
2776                         fallthrough;
2777                 default:
2778                         tcpm_pd_handle_state(port,
2779                                              port->pwr_role == TYPEC_SOURCE ?
2780                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2781                                              SNK_SOFT_RESET,
2782                                              NONE_AMS, 0);
2783                         break;
2784                 }
2785                 break;
2786         case PD_CTRL_ACCEPT:
2787                 switch (port->state) {
2788                 case SNK_NEGOTIATE_CAPABILITIES:
2789                         port->pps_data.active = false;
2790                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2791                         break;
2792                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2793                         port->pps_data.active = true;
2794                         port->pps_data.min_volt = port->pps_data.req_min_volt;
2795                         port->pps_data.max_volt = port->pps_data.req_max_volt;
2796                         port->pps_data.max_curr = port->pps_data.req_max_curr;
2797                         port->req_supply_voltage = port->pps_data.req_out_volt;
2798                         port->req_current_limit = port->pps_data.req_op_curr;
2799                         power_supply_changed(port->psy);
2800                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2801                         break;
2802                 case SOFT_RESET_SEND:
2803                         if (port->ams == SOFT_RESET_AMS)
2804                                 tcpm_ams_finish(port);
2805                         if (port->pwr_role == TYPEC_SOURCE) {
2806                                 port->upcoming_state = SRC_SEND_CAPABILITIES;
2807                                 tcpm_ams_start(port, POWER_NEGOTIATION);
2808                         } else {
2809                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2810                         }
2811                         break;
2812                 case DR_SWAP_SEND:
2813                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2814                         break;
2815                 case PR_SWAP_SEND:
2816                         tcpm_set_state(port, PR_SWAP_START, 0);
2817                         break;
2818                 case VCONN_SWAP_SEND:
2819                         tcpm_set_state(port, VCONN_SWAP_START, 0);
2820                         break;
2821                 case FR_SWAP_SEND:
2822                         tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2823                         break;
2824                 default:
2825                         tcpm_pd_handle_state(port,
2826                                              port->pwr_role == TYPEC_SOURCE ?
2827                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2828                                              SNK_SOFT_RESET,
2829                                              NONE_AMS, 0);
2830                         break;
2831                 }
2832                 break;
2833         case PD_CTRL_SOFT_RESET:
2834                 port->ams = SOFT_RESET_AMS;
2835                 tcpm_set_state(port, SOFT_RESET, 0);
2836                 break;
2837         case PD_CTRL_DR_SWAP:
2838                 /*
2839                  * XXX
2840                  * 6.3.9: If an alternate mode is active, a request to swap
2841                  * alternate modes shall trigger a port reset.
2842                  */
2843                 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2844                         tcpm_pd_handle_msg(port,
2845                                            port->negotiated_rev < PD_REV30 ?
2846                                            PD_MSG_CTRL_REJECT :
2847                                            PD_MSG_CTRL_NOT_SUPP,
2848                                            NONE_AMS);
2849                 } else {
2850                         if (port->send_discover) {
2851                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2852                                 break;
2853                         }
2854
2855                         tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2856                 }
2857                 break;
2858         case PD_CTRL_PR_SWAP:
2859                 if (port->port_type != TYPEC_PORT_DRP) {
2860                         tcpm_pd_handle_msg(port,
2861                                            port->negotiated_rev < PD_REV30 ?
2862                                            PD_MSG_CTRL_REJECT :
2863                                            PD_MSG_CTRL_NOT_SUPP,
2864                                            NONE_AMS);
2865                 } else {
2866                         if (port->send_discover) {
2867                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2868                                 break;
2869                         }
2870
2871                         tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2872                 }
2873                 break;
2874         case PD_CTRL_VCONN_SWAP:
2875                 if (port->send_discover) {
2876                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2877                         break;
2878                 }
2879
2880                 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2881                 break;
2882         case PD_CTRL_GET_SOURCE_CAP_EXT:
2883         case PD_CTRL_GET_STATUS:
2884         case PD_CTRL_FR_SWAP:
2885         case PD_CTRL_GET_PPS_STATUS:
2886         case PD_CTRL_GET_COUNTRY_CODES:
2887                 /* Currently not supported */
2888                 tcpm_pd_handle_msg(port,
2889                                    port->negotiated_rev < PD_REV30 ?
2890                                    PD_MSG_CTRL_REJECT :
2891                                    PD_MSG_CTRL_NOT_SUPP,
2892                                    NONE_AMS);
2893                 break;
2894         default:
2895                 tcpm_pd_handle_msg(port,
2896                                    port->negotiated_rev < PD_REV30 ?
2897                                    PD_MSG_CTRL_REJECT :
2898                                    PD_MSG_CTRL_NOT_SUPP,
2899                                    NONE_AMS);
2900                 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2901                 break;
2902         }
2903 }
2904
2905 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2906                                     const struct pd_message *msg)
2907 {
2908         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2909         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2910
2911         /* stopping VDM state machine if interrupted by other Messages */
2912         if (tcpm_vdm_ams(port)) {
2913                 port->vdm_state = VDM_STATE_ERR_BUSY;
2914                 tcpm_ams_finish(port);
2915                 mod_vdm_delayed_work(port, 0);
2916         }
2917
2918         if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2919                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2920                 tcpm_log(port, "Unchunked extended messages unsupported");
2921                 return;
2922         }
2923
2924         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2925                 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2926                 tcpm_log(port, "Chunk handling not yet supported");
2927                 return;
2928         }
2929
2930         switch (type) {
2931         case PD_EXT_STATUS:
2932         case PD_EXT_PPS_STATUS:
2933                 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2934                         tcpm_ams_finish(port);
2935                         tcpm_set_state(port, ready_state(port), 0);
2936                 } else {
2937                         /* unexpected Status or PPS_Status Message */
2938                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2939                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2940                                              NONE_AMS, 0);
2941                 }
2942                 break;
2943         case PD_EXT_SOURCE_CAP_EXT:
2944         case PD_EXT_GET_BATT_CAP:
2945         case PD_EXT_GET_BATT_STATUS:
2946         case PD_EXT_BATT_CAP:
2947         case PD_EXT_GET_MANUFACTURER_INFO:
2948         case PD_EXT_MANUFACTURER_INFO:
2949         case PD_EXT_SECURITY_REQUEST:
2950         case PD_EXT_SECURITY_RESPONSE:
2951         case PD_EXT_FW_UPDATE_REQUEST:
2952         case PD_EXT_FW_UPDATE_RESPONSE:
2953         case PD_EXT_COUNTRY_INFO:
2954         case PD_EXT_COUNTRY_CODES:
2955                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2956                 break;
2957         default:
2958                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2959                 tcpm_log(port, "Unrecognized extended message type %#x", type);
2960                 break;
2961         }
2962 }
2963
2964 static void tcpm_pd_rx_handler(struct kthread_work *work)
2965 {
2966         struct pd_rx_event *event = container_of(work,
2967                                                  struct pd_rx_event, work);
2968         const struct pd_message *msg = &event->msg;
2969         unsigned int cnt = pd_header_cnt_le(msg->header);
2970         struct tcpm_port *port = event->port;
2971
2972         mutex_lock(&port->lock);
2973
2974         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2975                  port->attached);
2976
2977         if (port->attached) {
2978                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2979                 unsigned int msgid = pd_header_msgid_le(msg->header);
2980
2981                 /*
2982                  * USB PD standard, 6.6.1.2:
2983                  * "... if MessageID value in a received Message is the
2984                  * same as the stored value, the receiver shall return a
2985                  * GoodCRC Message with that MessageID value and drop
2986                  * the Message (this is a retry of an already received
2987                  * Message). Note: this shall not apply to the Soft_Reset
2988                  * Message which always has a MessageID value of zero."
2989                  */
2990                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2991                         goto done;
2992                 port->rx_msgid = msgid;
2993
2994                 /*
2995                  * If both ends believe to be DFP/host, we have a data role
2996                  * mismatch.
2997                  */
2998                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2999                     (port->data_role == TYPEC_HOST)) {
3000                         tcpm_log(port,
3001                                  "Data role mismatch, initiating error recovery");
3002                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3003                 } else {
3004                         if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
3005                                 tcpm_pd_ext_msg_request(port, msg);
3006                         else if (cnt)
3007                                 tcpm_pd_data_request(port, msg);
3008                         else
3009                                 tcpm_pd_ctrl_request(port, msg);
3010                 }
3011         }
3012
3013 done:
3014         mutex_unlock(&port->lock);
3015         kfree(event);
3016 }
3017
3018 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
3019 {
3020         struct pd_rx_event *event;
3021
3022         event = kzalloc(sizeof(*event), GFP_ATOMIC);
3023         if (!event)
3024                 return;
3025
3026         kthread_init_work(&event->work, tcpm_pd_rx_handler);
3027         event->port = port;
3028         memcpy(&event->msg, msg, sizeof(*msg));
3029         kthread_queue_work(port->wq, &event->work);
3030 }
3031 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
3032
3033 static int tcpm_pd_send_control(struct tcpm_port *port,
3034                                 enum pd_ctrl_msg_type type)
3035 {
3036         struct pd_message msg;
3037
3038         memset(&msg, 0, sizeof(msg));
3039         msg.header = PD_HEADER_LE(type, port->pwr_role,
3040                                   port->data_role,
3041                                   port->negotiated_rev,
3042                                   port->message_id, 0);
3043
3044         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3045 }
3046
3047 /*
3048  * Send queued message without affecting state.
3049  * Return true if state machine should go back to sleep,
3050  * false otherwise.
3051  */
3052 static bool tcpm_send_queued_message(struct tcpm_port *port)
3053 {
3054         enum pd_msg_request queued_message;
3055         int ret;
3056
3057         do {
3058                 queued_message = port->queued_message;
3059                 port->queued_message = PD_MSG_NONE;
3060
3061                 switch (queued_message) {
3062                 case PD_MSG_CTRL_WAIT:
3063                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
3064                         break;
3065                 case PD_MSG_CTRL_REJECT:
3066                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3067                         break;
3068                 case PD_MSG_CTRL_NOT_SUPP:
3069                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
3070                         break;
3071                 case PD_MSG_DATA_SINK_CAP:
3072                         ret = tcpm_pd_send_sink_caps(port);
3073                         if (ret < 0) {
3074                                 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
3075                                 tcpm_set_state(port, SNK_SOFT_RESET, 0);
3076                         }
3077                         tcpm_ams_finish(port);
3078                         break;
3079                 case PD_MSG_DATA_SOURCE_CAP:
3080                         ret = tcpm_pd_send_source_caps(port);
3081                         if (ret < 0) {
3082                                 tcpm_log(port,
3083                                          "Unable to send src caps, ret=%d",
3084                                          ret);
3085                                 tcpm_set_state(port, SOFT_RESET_SEND, 0);
3086                         } else if (port->pwr_role == TYPEC_SOURCE) {
3087                                 tcpm_ams_finish(port);
3088                                 tcpm_set_state(port, HARD_RESET_SEND,
3089                                                PD_T_SENDER_RESPONSE);
3090                         } else {
3091                                 tcpm_ams_finish(port);
3092                         }
3093                         break;
3094                 default:
3095                         break;
3096                 }
3097         } while (port->queued_message != PD_MSG_NONE);
3098
3099         if (port->delayed_state != INVALID_STATE) {
3100                 if (ktime_after(port->delayed_runtime, ktime_get())) {
3101                         mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
3102                                                                           ktime_get())));
3103                         return true;
3104                 }
3105                 port->delayed_state = INVALID_STATE;
3106         }
3107         return false;
3108 }
3109
3110 static int tcpm_pd_check_request(struct tcpm_port *port)
3111 {
3112         u32 pdo, rdo = port->sink_request;
3113         unsigned int max, op, pdo_max, index;
3114         enum pd_pdo_type type;
3115
3116         index = rdo_index(rdo);
3117         if (!index || index > port->nr_src_pdo)
3118                 return -EINVAL;
3119
3120         pdo = port->src_pdo[index - 1];
3121         type = pdo_type(pdo);
3122         switch (type) {
3123         case PDO_TYPE_FIXED:
3124         case PDO_TYPE_VAR:
3125                 max = rdo_max_current(rdo);
3126                 op = rdo_op_current(rdo);
3127                 pdo_max = pdo_max_current(pdo);
3128
3129                 if (op > pdo_max)
3130                         return -EINVAL;
3131                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3132                         return -EINVAL;
3133
3134                 if (type == PDO_TYPE_FIXED)
3135                         tcpm_log(port,
3136                                  "Requested %u mV, %u mA for %u / %u mA",
3137                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
3138                 else
3139                         tcpm_log(port,
3140                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
3141                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3142                                  pdo_max, op, max);
3143                 break;
3144         case PDO_TYPE_BATT:
3145                 max = rdo_max_power(rdo);
3146                 op = rdo_op_power(rdo);
3147                 pdo_max = pdo_max_power(pdo);
3148
3149                 if (op > pdo_max)
3150                         return -EINVAL;
3151                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3152                         return -EINVAL;
3153                 tcpm_log(port,
3154                          "Requested %u -> %u mV, %u mW for %u / %u mW",
3155                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3156                          pdo_max, op, max);
3157                 break;
3158         default:
3159                 return -EINVAL;
3160         }
3161
3162         port->op_vsafe5v = index == 1;
3163
3164         return 0;
3165 }
3166
3167 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3168 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3169
3170 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3171                               int *src_pdo)
3172 {
3173         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3174                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3175                      min_snk_mv = 0;
3176         int ret = -EINVAL;
3177
3178         port->pps_data.supported = false;
3179         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3180         power_supply_changed(port->psy);
3181
3182         /*
3183          * Select the source PDO providing the most power which has a
3184          * matchig sink cap.
3185          */
3186         for (i = 0; i < port->nr_source_caps; i++) {
3187                 u32 pdo = port->source_caps[i];
3188                 enum pd_pdo_type type = pdo_type(pdo);
3189
3190                 switch (type) {
3191                 case PDO_TYPE_FIXED:
3192                         max_src_mv = pdo_fixed_voltage(pdo);
3193                         min_src_mv = max_src_mv;
3194                         break;
3195                 case PDO_TYPE_BATT:
3196                 case PDO_TYPE_VAR:
3197                         max_src_mv = pdo_max_voltage(pdo);
3198                         min_src_mv = pdo_min_voltage(pdo);
3199                         break;
3200                 case PDO_TYPE_APDO:
3201                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3202                                 port->pps_data.supported = true;
3203                                 port->usb_type =
3204                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
3205                                 power_supply_changed(port->psy);
3206                         }
3207                         continue;
3208                 default:
3209                         tcpm_log(port, "Invalid source PDO type, ignoring");
3210                         continue;
3211                 }
3212
3213                 switch (type) {
3214                 case PDO_TYPE_FIXED:
3215                 case PDO_TYPE_VAR:
3216                         src_ma = pdo_max_current(pdo);
3217                         src_mw = src_ma * min_src_mv / 1000;
3218                         break;
3219                 case PDO_TYPE_BATT:
3220                         src_mw = pdo_max_power(pdo);
3221                         break;
3222                 case PDO_TYPE_APDO:
3223                         continue;
3224                 default:
3225                         tcpm_log(port, "Invalid source PDO type, ignoring");
3226                         continue;
3227                 }
3228
3229                 for (j = 0; j < port->nr_snk_pdo; j++) {
3230                         pdo = port->snk_pdo[j];
3231
3232                         switch (pdo_type(pdo)) {
3233                         case PDO_TYPE_FIXED:
3234                                 max_snk_mv = pdo_fixed_voltage(pdo);
3235                                 min_snk_mv = max_snk_mv;
3236                                 break;
3237                         case PDO_TYPE_BATT:
3238                         case PDO_TYPE_VAR:
3239                                 max_snk_mv = pdo_max_voltage(pdo);
3240                                 min_snk_mv = pdo_min_voltage(pdo);
3241                                 break;
3242                         case PDO_TYPE_APDO:
3243                                 continue;
3244                         default:
3245                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
3246                                 continue;
3247                         }
3248
3249                         if (max_src_mv <= max_snk_mv &&
3250                                 min_src_mv >= min_snk_mv) {
3251                                 /* Prefer higher voltages if available */
3252                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3253                                                         src_mw > max_mw) {
3254                                         *src_pdo = i;
3255                                         *sink_pdo = j;
3256                                         max_mw = src_mw;
3257                                         max_mv = min_src_mv;
3258                                         ret = 0;
3259                                 }
3260                         }
3261                 }
3262         }
3263
3264         return ret;
3265 }
3266
3267 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3268 {
3269         unsigned int i, src_ma, max_temp_mw = 0, max_op_ma, op_mw;
3270         unsigned int src_pdo = 0;
3271         u32 pdo, src;
3272
3273         for (i = 1; i < port->nr_source_caps; ++i) {
3274                 pdo = port->source_caps[i];
3275
3276                 switch (pdo_type(pdo)) {
3277                 case PDO_TYPE_APDO:
3278                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3279                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
3280                                 continue;
3281                         }
3282
3283                         if (port->pps_data.req_out_volt > pdo_pps_apdo_max_voltage(pdo) ||
3284                             port->pps_data.req_out_volt < pdo_pps_apdo_min_voltage(pdo))
3285                                 continue;
3286
3287                         src_ma = pdo_pps_apdo_max_current(pdo);
3288                         max_op_ma = min(src_ma, port->pps_data.req_op_curr);
3289                         op_mw = max_op_ma * port->pps_data.req_out_volt / 1000;
3290                         if (op_mw > max_temp_mw) {
3291                                 src_pdo = i;
3292                                 max_temp_mw = op_mw;
3293                         }
3294                         break;
3295                 default:
3296                         tcpm_log(port, "Not APDO type (source), ignoring");
3297                         continue;
3298                 }
3299         }
3300
3301         if (src_pdo) {
3302                 src = port->source_caps[src_pdo];
3303
3304                 port->pps_data.req_min_volt = pdo_pps_apdo_min_voltage(src);
3305                 port->pps_data.req_max_volt = pdo_pps_apdo_max_voltage(src);
3306                 port->pps_data.req_max_curr = pdo_pps_apdo_max_current(src);
3307                 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3308                                                  port->pps_data.req_op_curr);
3309         }
3310
3311         return src_pdo;
3312 }
3313
3314 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3315 {
3316         unsigned int mv, ma, mw, flags;
3317         unsigned int max_ma, max_mw;
3318         enum pd_pdo_type type;
3319         u32 pdo, matching_snk_pdo;
3320         int src_pdo_index = 0;
3321         int snk_pdo_index = 0;
3322         int ret;
3323
3324         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3325         if (ret < 0)
3326                 return ret;
3327
3328         pdo = port->source_caps[src_pdo_index];
3329         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3330         type = pdo_type(pdo);
3331
3332         switch (type) {
3333         case PDO_TYPE_FIXED:
3334                 mv = pdo_fixed_voltage(pdo);
3335                 break;
3336         case PDO_TYPE_BATT:
3337         case PDO_TYPE_VAR:
3338                 mv = pdo_min_voltage(pdo);
3339                 break;
3340         default:
3341                 tcpm_log(port, "Invalid PDO selected!");
3342                 return -EINVAL;
3343         }
3344
3345         /* Select maximum available current within the sink pdo's limit */
3346         if (type == PDO_TYPE_BATT) {
3347                 mw = min_power(pdo, matching_snk_pdo);
3348                 ma = 1000 * mw / mv;
3349         } else {
3350                 ma = min_current(pdo, matching_snk_pdo);
3351                 mw = ma * mv / 1000;
3352         }
3353
3354         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3355
3356         /* Set mismatch bit if offered power is less than operating power */
3357         max_ma = ma;
3358         max_mw = mw;
3359         if (mw < port->operating_snk_mw) {
3360                 flags |= RDO_CAP_MISMATCH;
3361                 if (type == PDO_TYPE_BATT &&
3362                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3363                         max_mw = pdo_max_power(matching_snk_pdo);
3364                 else if (pdo_max_current(matching_snk_pdo) >
3365                          pdo_max_current(pdo))
3366                         max_ma = pdo_max_current(matching_snk_pdo);
3367         }
3368
3369         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3370                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3371                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3372                  port->polarity);
3373
3374         if (type == PDO_TYPE_BATT) {
3375                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3376
3377                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3378                          src_pdo_index, mv, mw,
3379                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3380         } else {
3381                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3382
3383                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3384                          src_pdo_index, mv, ma,
3385                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3386         }
3387
3388         port->req_current_limit = ma;
3389         port->req_supply_voltage = mv;
3390
3391         return 0;
3392 }
3393
3394 static int tcpm_pd_send_request(struct tcpm_port *port)
3395 {
3396         struct pd_message msg;
3397         int ret;
3398         u32 rdo;
3399
3400         ret = tcpm_pd_build_request(port, &rdo);
3401         if (ret < 0)
3402                 return ret;
3403
3404         /*
3405          * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3406          * It is safer to modify the threshold here.
3407          */
3408         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3409
3410         memset(&msg, 0, sizeof(msg));
3411         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3412                                   port->pwr_role,
3413                                   port->data_role,
3414                                   port->negotiated_rev,
3415                                   port->message_id, 1);
3416         msg.payload[0] = cpu_to_le32(rdo);
3417
3418         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3419 }
3420
3421 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3422 {
3423         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3424         unsigned int src_pdo_index;
3425
3426         src_pdo_index = tcpm_pd_select_pps_apdo(port);
3427         if (!src_pdo_index)
3428                 return -EOPNOTSUPP;
3429
3430         max_mv = port->pps_data.req_max_volt;
3431         max_ma = port->pps_data.req_max_curr;
3432         out_mv = port->pps_data.req_out_volt;
3433         op_ma = port->pps_data.req_op_curr;
3434
3435         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3436
3437         op_mw = (op_ma * out_mv) / 1000;
3438         if (op_mw < port->operating_snk_mw) {
3439                 /*
3440                  * Try raising current to meet power needs. If that's not enough
3441                  * then try upping the voltage. If that's still not enough
3442                  * then we've obviously chosen a PPS APDO which really isn't
3443                  * suitable so abandon ship.
3444                  */
3445                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3446                 if ((port->operating_snk_mw * 1000) % out_mv)
3447                         ++op_ma;
3448                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3449
3450                 if (op_ma > max_ma) {
3451                         op_ma = max_ma;
3452                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
3453                         if ((port->operating_snk_mw * 1000) % op_ma)
3454                                 ++out_mv;
3455                         out_mv += RDO_PROG_VOLT_MV_STEP -
3456                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
3457
3458                         if (out_mv > max_mv) {
3459                                 tcpm_log(port, "Invalid PPS APDO selected!");
3460                                 return -EINVAL;
3461                         }
3462                 }
3463         }
3464
3465         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3466                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3467                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3468                  port->polarity);
3469
3470         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3471
3472         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3473                  src_pdo_index, out_mv, op_ma);
3474
3475         port->pps_data.req_op_curr = op_ma;
3476         port->pps_data.req_out_volt = out_mv;
3477
3478         return 0;
3479 }
3480
3481 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3482 {
3483         struct pd_message msg;
3484         int ret;
3485         u32 rdo;
3486
3487         ret = tcpm_pd_build_pps_request(port, &rdo);
3488         if (ret < 0)
3489                 return ret;
3490
3491         /* Relax the threshold as voltage will be adjusted right after Accept Message. */
3492         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3493
3494         memset(&msg, 0, sizeof(msg));
3495         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3496                                   port->pwr_role,
3497                                   port->data_role,
3498                                   port->negotiated_rev,
3499                                   port->message_id, 1);
3500         msg.payload[0] = cpu_to_le32(rdo);
3501
3502         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3503 }
3504
3505 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3506 {
3507         int ret;
3508
3509         if (enable && port->vbus_charge)
3510                 return -EINVAL;
3511
3512         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3513
3514         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3515         if (ret < 0)
3516                 return ret;
3517
3518         port->vbus_source = enable;
3519         return 0;
3520 }
3521
3522 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3523 {
3524         int ret;
3525
3526         if (charge && port->vbus_source)
3527                 return -EINVAL;
3528
3529         if (charge != port->vbus_charge) {
3530                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3531                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3532                                            charge);
3533                 if (ret < 0)
3534                         return ret;
3535         }
3536         port->vbus_charge = charge;
3537         power_supply_changed(port->psy);
3538         return 0;
3539 }
3540
3541 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3542 {
3543         int ret;
3544
3545         if (!port->tcpc->start_toggling)
3546                 return false;
3547
3548         tcpm_log_force(port, "Start toggling");
3549         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3550         return ret == 0;
3551 }
3552
3553 static int tcpm_init_vbus(struct tcpm_port *port)
3554 {
3555         int ret;
3556
3557         ret = port->tcpc->set_vbus(port->tcpc, false, false);
3558         port->vbus_source = false;
3559         port->vbus_charge = false;
3560         return ret;
3561 }
3562
3563 static int tcpm_init_vconn(struct tcpm_port *port)
3564 {
3565         int ret;
3566
3567         ret = port->tcpc->set_vconn(port->tcpc, false);
3568         port->vconn_role = TYPEC_SINK;
3569         return ret;
3570 }
3571
3572 static void tcpm_typec_connect(struct tcpm_port *port)
3573 {
3574         if (!port->connected) {
3575                 /* Make sure we don't report stale identity information */
3576                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3577                 port->partner_desc.usb_pd = port->pd_capable;
3578                 if (tcpm_port_is_debug(port))
3579                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3580                 else if (tcpm_port_is_audio(port))
3581                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3582                 else
3583                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3584                 port->partner = typec_register_partner(port->typec_port,
3585                                                        &port->partner_desc);
3586                 port->connected = true;
3587                 typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);
3588         }
3589 }
3590
3591 static int tcpm_src_attach(struct tcpm_port *port)
3592 {
3593         enum typec_cc_polarity polarity =
3594                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3595                                                          : TYPEC_POLARITY_CC1;
3596         int ret;
3597
3598         if (port->attached)
3599                 return 0;
3600
3601         ret = tcpm_set_polarity(port, polarity);
3602         if (ret < 0)
3603                 return ret;
3604
3605         tcpm_enable_auto_vbus_discharge(port, true);
3606
3607         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3608         if (ret < 0)
3609                 return ret;
3610
3611         if (port->pd_supported) {
3612                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3613                 if (ret < 0)
3614                         goto out_disable_mux;
3615         }
3616
3617         /*
3618          * USB Type-C specification, version 1.2,
3619          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3620          * Enable VCONN only if the non-RD port is set to RA.
3621          */
3622         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3623             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3624                 ret = tcpm_set_vconn(port, true);
3625                 if (ret < 0)
3626                         goto out_disable_pd;
3627         }
3628
3629         ret = tcpm_set_vbus(port, true);
3630         if (ret < 0)
3631                 goto out_disable_vconn;
3632
3633         port->pd_capable = false;
3634
3635         port->partner = NULL;
3636
3637         port->attached = true;
3638         port->send_discover = true;
3639
3640         return 0;
3641
3642 out_disable_vconn:
3643         tcpm_set_vconn(port, false);
3644 out_disable_pd:
3645         if (port->pd_supported)
3646                 port->tcpc->set_pd_rx(port->tcpc, false);
3647 out_disable_mux:
3648         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3649                      TYPEC_ORIENTATION_NONE);
3650         return ret;
3651 }
3652
3653 static void tcpm_typec_disconnect(struct tcpm_port *port)
3654 {
3655         if (port->connected) {
3656                 typec_partner_set_usb_power_delivery(port->partner, NULL);
3657                 typec_unregister_partner(port->partner);
3658                 port->partner = NULL;
3659                 port->connected = false;
3660         }
3661 }
3662
3663 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3664 {
3665         struct pd_mode_data *modep = &port->mode_data;
3666         int i;
3667
3668         for (i = 0; i < modep->altmodes; i++) {
3669                 typec_unregister_altmode(port->partner_altmode[i]);
3670                 port->partner_altmode[i] = NULL;
3671         }
3672
3673         memset(modep, 0, sizeof(*modep));
3674 }
3675
3676 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3677 {
3678         tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3679
3680         if (port->tcpc->set_partner_usb_comm_capable)
3681                 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3682 }
3683
3684 static void tcpm_reset_port(struct tcpm_port *port)
3685 {
3686         tcpm_enable_auto_vbus_discharge(port, false);
3687         port->in_ams = false;
3688         port->ams = NONE_AMS;
3689         port->vdm_sm_running = false;
3690         tcpm_unregister_altmodes(port);
3691         tcpm_typec_disconnect(port);
3692         port->attached = false;
3693         port->pd_capable = false;
3694         port->pps_data.supported = false;
3695         tcpm_set_partner_usb_comm_capable(port, false);
3696
3697         /*
3698          * First Rx ID should be 0; set this to a sentinel of -1 so that
3699          * we can check tcpm_pd_rx_handler() if we had seen it before.
3700          */
3701         port->rx_msgid = -1;
3702
3703         port->tcpc->set_pd_rx(port->tcpc, false);
3704         tcpm_init_vbus(port);   /* also disables charging */
3705         tcpm_init_vconn(port);
3706         tcpm_set_current_limit(port, 0, 0);
3707         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3708         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3709                      TYPEC_ORIENTATION_NONE);
3710         tcpm_set_attached_state(port, false);
3711         port->try_src_count = 0;
3712         port->try_snk_count = 0;
3713         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3714         power_supply_changed(port->psy);
3715         port->nr_sink_caps = 0;
3716         port->sink_cap_done = false;
3717         if (port->tcpc->enable_frs)
3718                 port->tcpc->enable_frs(port->tcpc, false);
3719
3720         usb_power_delivery_unregister_capabilities(port->partner_sink_caps);
3721         port->partner_sink_caps = NULL;
3722         usb_power_delivery_unregister_capabilities(port->partner_source_caps);
3723         port->partner_source_caps = NULL;
3724         usb_power_delivery_unregister(port->partner_pd);
3725         port->partner_pd = NULL;
3726 }
3727
3728 static void tcpm_detach(struct tcpm_port *port)
3729 {
3730         if (tcpm_port_is_disconnected(port))
3731                 port->hard_reset_count = 0;
3732
3733         if (!port->attached)
3734                 return;
3735
3736         if (port->tcpc->set_bist_data) {
3737                 tcpm_log(port, "disable BIST MODE TESTDATA");
3738                 port->tcpc->set_bist_data(port->tcpc, false);
3739         }
3740
3741         tcpm_reset_port(port);
3742 }
3743
3744 static void tcpm_src_detach(struct tcpm_port *port)
3745 {
3746         tcpm_detach(port);
3747 }
3748
3749 static int tcpm_snk_attach(struct tcpm_port *port)
3750 {
3751         int ret;
3752
3753         if (port->attached)
3754                 return 0;
3755
3756         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3757                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3758         if (ret < 0)
3759                 return ret;
3760
3761         tcpm_enable_auto_vbus_discharge(port, true);
3762
3763         ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3764         if (ret < 0)
3765                 return ret;
3766
3767         port->pd_capable = false;
3768
3769         port->partner = NULL;
3770
3771         port->attached = true;
3772         port->send_discover = true;
3773
3774         return 0;
3775 }
3776
3777 static void tcpm_snk_detach(struct tcpm_port *port)
3778 {
3779         tcpm_detach(port);
3780 }
3781
3782 static int tcpm_acc_attach(struct tcpm_port *port)
3783 {
3784         int ret;
3785
3786         if (port->attached)
3787                 return 0;
3788
3789         ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3790                              tcpm_data_role_for_source(port));
3791         if (ret < 0)
3792                 return ret;
3793
3794         port->partner = NULL;
3795
3796         tcpm_typec_connect(port);
3797
3798         port->attached = true;
3799
3800         return 0;
3801 }
3802
3803 static void tcpm_acc_detach(struct tcpm_port *port)
3804 {
3805         tcpm_detach(port);
3806 }
3807
3808 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3809 {
3810         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3811                 return HARD_RESET_SEND;
3812         if (port->pd_capable)
3813                 return ERROR_RECOVERY;
3814         if (port->pwr_role == TYPEC_SOURCE)
3815                 return SRC_UNATTACHED;
3816         if (port->state == SNK_WAIT_CAPABILITIES)
3817                 return SNK_READY;
3818         return SNK_UNATTACHED;
3819 }
3820
3821 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3822 {
3823         if (port->port_type == TYPEC_PORT_DRP) {
3824                 if (port->pwr_role == TYPEC_SOURCE)
3825                         return SRC_UNATTACHED;
3826                 else
3827                         return SNK_UNATTACHED;
3828         } else if (port->port_type == TYPEC_PORT_SRC) {
3829                 return SRC_UNATTACHED;
3830         }
3831
3832         return SNK_UNATTACHED;
3833 }
3834
3835 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3836 {
3837         if (port->swap_pending) {
3838                 port->swap_status = result;
3839                 port->swap_pending = false;
3840                 port->non_pd_role_swap = false;
3841                 complete(&port->swap_complete);
3842         }
3843 }
3844
3845 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3846 {
3847         switch (cc) {
3848         case TYPEC_CC_RP_1_5:
3849                 return TYPEC_PWR_MODE_1_5A;
3850         case TYPEC_CC_RP_3_0:
3851                 return TYPEC_PWR_MODE_3_0A;
3852         case TYPEC_CC_RP_DEF:
3853         default:
3854                 return TYPEC_PWR_MODE_USB;
3855         }
3856 }
3857
3858 static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
3859 {
3860         switch (opmode) {
3861         case TYPEC_PWR_MODE_USB:
3862                 return TYPEC_CC_RP_DEF;
3863         case TYPEC_PWR_MODE_1_5A:
3864                 return TYPEC_CC_RP_1_5;
3865         case TYPEC_PWR_MODE_3_0A:
3866         case TYPEC_PWR_MODE_PD:
3867         default:
3868                 return TYPEC_CC_RP_3_0;
3869         }
3870 }
3871
3872 static void tcpm_set_initial_svdm_version(struct tcpm_port *port)
3873 {
3874         switch (port->negotiated_rev) {
3875         case PD_REV30:
3876                 break;
3877         /*
3878          * 6.4.4.2.3 Structured VDM Version
3879          * 2.0 states "At this time, there is only one version (1.0) defined.
3880          * This field Shall be set to zero to indicate Version 1.0."
3881          * 3.0 states "This field Shall be set to 01b to indicate Version 2.0."
3882          * To ensure that we follow the Power Delivery revision we are currently
3883          * operating on, downgrade the SVDM version to the highest one supported
3884          * by the Power Delivery revision.
3885          */
3886         case PD_REV20:
3887                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3888                 break;
3889         default:
3890                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3891                 break;
3892         }
3893 }
3894
3895 static void run_state_machine(struct tcpm_port *port)
3896 {
3897         int ret;
3898         enum typec_pwr_opmode opmode;
3899         unsigned int msecs;
3900         enum tcpm_state upcoming_state;
3901
3902         if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT)
3903                 port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT &&
3904                                                 port->state == SRC_UNATTACHED) ||
3905                                                (port->enter_state == SNK_ATTACH_WAIT &&
3906                                                 port->state == SNK_UNATTACHED) ||
3907                                                (port->enter_state == SNK_DEBOUNCED &&
3908                                                 port->state == SNK_UNATTACHED));
3909
3910         port->enter_state = port->state;
3911         switch (port->state) {
3912         case TOGGLING:
3913                 break;
3914         case CHECK_CONTAMINANT:
3915                 port->tcpc->check_contaminant(port->tcpc);
3916                 break;
3917         /* SRC states */
3918         case SRC_UNATTACHED:
3919                 if (!port->non_pd_role_swap)
3920                         tcpm_swap_complete(port, -ENOTCONN);
3921                 tcpm_src_detach(port);
3922                 if (port->potential_contaminant) {
3923                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
3924                         break;
3925                 }
3926                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3927                         tcpm_set_state(port, TOGGLING, 0);
3928                         break;
3929                 }
3930                 tcpm_set_cc(port, tcpm_rp_cc(port));
3931                 if (port->port_type == TYPEC_PORT_DRP)
3932                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3933                 break;
3934         case SRC_ATTACH_WAIT:
3935                 if (tcpm_port_is_debug(port))
3936                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3937                                        PD_T_CC_DEBOUNCE);
3938                 else if (tcpm_port_is_audio(port))
3939                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3940                                        PD_T_CC_DEBOUNCE);
3941                 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3942                         tcpm_set_state(port,
3943                                        tcpm_try_snk(port) ? SNK_TRY
3944                                                           : SRC_ATTACHED,
3945                                        PD_T_CC_DEBOUNCE);
3946                 break;
3947
3948         case SNK_TRY:
3949                 port->try_snk_count++;
3950                 /*
3951                  * Requirements:
3952                  * - Do not drive vconn or vbus
3953                  * - Terminate CC pins (both) to Rd
3954                  * Action:
3955                  * - Wait for tDRPTry (PD_T_DRP_TRY).
3956                  *   Until then, ignore any state changes.
3957                  */
3958                 tcpm_set_cc(port, TYPEC_CC_RD);
3959                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3960                 break;
3961         case SNK_TRY_WAIT:
3962                 if (tcpm_port_is_sink(port)) {
3963                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3964                 } else {
3965                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3966                         port->max_wait = 0;
3967                 }
3968                 break;
3969         case SNK_TRY_WAIT_DEBOUNCE:
3970                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3971                                PD_T_TRY_CC_DEBOUNCE);
3972                 break;
3973         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3974                 if (port->vbus_present && tcpm_port_is_sink(port))
3975                         tcpm_set_state(port, SNK_ATTACHED, 0);
3976                 else
3977                         port->max_wait = 0;
3978                 break;
3979         case SRC_TRYWAIT:
3980                 tcpm_set_cc(port, tcpm_rp_cc(port));
3981                 if (port->max_wait == 0) {
3982                         port->max_wait = jiffies +
3983                                          msecs_to_jiffies(PD_T_DRP_TRY);
3984                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3985                                        PD_T_DRP_TRY);
3986                 } else {
3987                         if (time_is_after_jiffies(port->max_wait))
3988                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3989                                                jiffies_to_msecs(port->max_wait -
3990                                                                 jiffies));
3991                         else
3992                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3993                 }
3994                 break;
3995         case SRC_TRYWAIT_DEBOUNCE:
3996                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3997                 break;
3998         case SRC_TRYWAIT_UNATTACHED:
3999                 tcpm_set_state(port, SNK_UNATTACHED, 0);
4000                 break;
4001
4002         case SRC_ATTACHED:
4003                 ret = tcpm_src_attach(port);
4004                 tcpm_set_state(port, SRC_UNATTACHED,
4005                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
4006                 break;
4007         case SRC_STARTUP:
4008                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
4009                 typec_set_pwr_opmode(port->typec_port, opmode);
4010                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4011                 port->caps_count = 0;
4012                 port->negotiated_rev = PD_MAX_REV;
4013                 port->message_id = 0;
4014                 port->rx_msgid = -1;
4015                 port->explicit_contract = false;
4016                 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
4017                 if (port->ams == POWER_ROLE_SWAP ||
4018                     port->ams == FAST_ROLE_SWAP)
4019                         tcpm_ams_finish(port);
4020                 if (!port->pd_supported) {
4021                         tcpm_set_state(port, SRC_READY, 0);
4022                         break;
4023                 }
4024                 port->upcoming_state = SRC_SEND_CAPABILITIES;
4025                 tcpm_ams_start(port, POWER_NEGOTIATION);
4026                 break;
4027         case SRC_SEND_CAPABILITIES:
4028                 port->caps_count++;
4029                 if (port->caps_count > PD_N_CAPS_COUNT) {
4030                         tcpm_set_state(port, SRC_READY, 0);
4031                         break;
4032                 }
4033                 ret = tcpm_pd_send_source_caps(port);
4034                 if (ret < 0) {
4035                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
4036                                        PD_T_SEND_SOURCE_CAP);
4037                 } else {
4038                         /*
4039                          * Per standard, we should clear the reset counter here.
4040                          * However, that can result in state machine hang-ups.
4041                          * Reset it only in READY state to improve stability.
4042                          */
4043                         /* port->hard_reset_count = 0; */
4044                         port->caps_count = 0;
4045                         port->pd_capable = true;
4046                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
4047                                             PD_T_SEND_SOURCE_CAP);
4048                 }
4049                 break;
4050         case SRC_SEND_CAPABILITIES_TIMEOUT:
4051                 /*
4052                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
4053                  *
4054                  * PD 2.0 sinks are supposed to accept src-capabilities with a
4055                  * 3.0 header and simply ignore any src PDOs which the sink does
4056                  * not understand such as PPS but some 2.0 sinks instead ignore
4057                  * the entire PD_DATA_SOURCE_CAP message, causing contract
4058                  * negotiation to fail.
4059                  *
4060                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
4061                  * sending src-capabilities with a lower PD revision to
4062                  * make these broken sinks work.
4063                  */
4064                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
4065                         tcpm_set_state(port, HARD_RESET_SEND, 0);
4066                 } else if (port->negotiated_rev > PD_REV20) {
4067                         port->negotiated_rev--;
4068                         port->hard_reset_count = 0;
4069                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4070                 } else {
4071                         tcpm_set_state(port, hard_reset_state(port), 0);
4072                 }
4073                 break;
4074         case SRC_NEGOTIATE_CAPABILITIES:
4075                 ret = tcpm_pd_check_request(port);
4076                 if (ret < 0) {
4077                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
4078                         if (!port->explicit_contract) {
4079                                 tcpm_set_state(port,
4080                                                SRC_WAIT_NEW_CAPABILITIES, 0);
4081                         } else {
4082                                 tcpm_set_state(port, SRC_READY, 0);
4083                         }
4084                 } else {
4085                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4086                         tcpm_set_partner_usb_comm_capable(port,
4087                                                           !!(port->sink_request & RDO_USB_COMM));
4088                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
4089                                        PD_T_SRC_TRANSITION);
4090                 }
4091                 break;
4092         case SRC_TRANSITION_SUPPLY:
4093                 /* XXX: regulator_set_voltage(vbus, ...) */
4094                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4095                 port->explicit_contract = true;
4096                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
4097                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
4098                 tcpm_set_state_cond(port, SRC_READY, 0);
4099                 break;
4100         case SRC_READY:
4101 #if 1
4102                 port->hard_reset_count = 0;
4103 #endif
4104                 port->try_src_count = 0;
4105
4106                 tcpm_swap_complete(port, 0);
4107                 tcpm_typec_connect(port);
4108
4109                 if (port->ams != NONE_AMS)
4110                         tcpm_ams_finish(port);
4111                 if (port->next_ams != NONE_AMS) {
4112                         port->ams = port->next_ams;
4113                         port->next_ams = NONE_AMS;
4114                 }
4115
4116                 /*
4117                  * If previous AMS is interrupted, switch to the upcoming
4118                  * state.
4119                  */
4120                 if (port->upcoming_state != INVALID_STATE) {
4121                         upcoming_state = port->upcoming_state;
4122                         port->upcoming_state = INVALID_STATE;
4123                         tcpm_set_state(port, upcoming_state, 0);
4124                         break;
4125                 }
4126
4127                 /*
4128                  * 6.4.4.3.1 Discover Identity
4129                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4130                  * Explicit Contract."
4131                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4132                  * port->explicit_contract to decide whether to send the command.
4133                  */
4134                 if (port->explicit_contract) {
4135                         tcpm_set_initial_svdm_version(port);
4136                         mod_send_discover_delayed_work(port, 0);
4137                 } else {
4138                         port->send_discover = false;
4139                 }
4140
4141                 /*
4142                  * 6.3.5
4143                  * Sending ping messages is not necessary if
4144                  * - the source operates at vSafe5V
4145                  * or
4146                  * - The system is not operating in PD mode
4147                  * or
4148                  * - Both partners are connected using a Type-C connector
4149                  *
4150                  * There is no actual need to send PD messages since the local
4151                  * port type-c and the spec does not clearly say whether PD is
4152                  * possible when type-c is connected to Type-A/B
4153                  */
4154                 break;
4155         case SRC_WAIT_NEW_CAPABILITIES:
4156                 /* Nothing to do... */
4157                 break;
4158
4159         /* SNK states */
4160         case SNK_UNATTACHED:
4161                 if (!port->non_pd_role_swap)
4162                         tcpm_swap_complete(port, -ENOTCONN);
4163                 tcpm_pps_complete(port, -ENOTCONN);
4164                 tcpm_snk_detach(port);
4165                 if (port->potential_contaminant) {
4166                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
4167                         break;
4168                 }
4169                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4170                         tcpm_set_state(port, TOGGLING, 0);
4171                         break;
4172                 }
4173                 tcpm_set_cc(port, TYPEC_CC_RD);
4174                 if (port->port_type == TYPEC_PORT_DRP)
4175                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4176                 break;
4177         case SNK_ATTACH_WAIT:
4178                 if ((port->cc1 == TYPEC_CC_OPEN &&
4179                      port->cc2 != TYPEC_CC_OPEN) ||
4180                     (port->cc1 != TYPEC_CC_OPEN &&
4181                      port->cc2 == TYPEC_CC_OPEN))
4182                         tcpm_set_state(port, SNK_DEBOUNCED,
4183                                        PD_T_CC_DEBOUNCE);
4184                 else if (tcpm_port_is_disconnected(port))
4185                         tcpm_set_state(port, SNK_UNATTACHED,
4186                                        PD_T_PD_DEBOUNCE);
4187                 break;
4188         case SNK_DEBOUNCED:
4189                 if (tcpm_port_is_disconnected(port))
4190                         tcpm_set_state(port, SNK_UNATTACHED,
4191                                        PD_T_PD_DEBOUNCE);
4192                 else if (port->vbus_present)
4193                         tcpm_set_state(port,
4194                                        tcpm_try_src(port) ? SRC_TRY
4195                                                           : SNK_ATTACHED,
4196                                        0);
4197                 break;
4198         case SRC_TRY:
4199                 port->try_src_count++;
4200                 tcpm_set_cc(port, tcpm_rp_cc(port));
4201                 port->max_wait = 0;
4202                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4203                 break;
4204         case SRC_TRY_WAIT:
4205                 if (port->max_wait == 0) {
4206                         port->max_wait = jiffies +
4207                                          msecs_to_jiffies(PD_T_DRP_TRY);
4208                         msecs = PD_T_DRP_TRY;
4209                 } else {
4210                         if (time_is_after_jiffies(port->max_wait))
4211                                 msecs = jiffies_to_msecs(port->max_wait -
4212                                                          jiffies);
4213                         else
4214                                 msecs = 0;
4215                 }
4216                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4217                 break;
4218         case SRC_TRY_DEBOUNCE:
4219                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4220                 break;
4221         case SNK_TRYWAIT:
4222                 tcpm_set_cc(port, TYPEC_CC_RD);
4223                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4224                 break;
4225         case SNK_TRYWAIT_VBUS:
4226                 /*
4227                  * TCPM stays in this state indefinitely until VBUS
4228                  * is detected as long as Rp is not detected for
4229                  * more than a time period of tPDDebounce.
4230                  */
4231                 if (port->vbus_present && tcpm_port_is_sink(port)) {
4232                         tcpm_set_state(port, SNK_ATTACHED, 0);
4233                         break;
4234                 }
4235                 if (!tcpm_port_is_sink(port))
4236                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4237                 break;
4238         case SNK_TRYWAIT_DEBOUNCE:
4239                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4240                 break;
4241         case SNK_ATTACHED:
4242                 ret = tcpm_snk_attach(port);
4243                 if (ret < 0)
4244                         tcpm_set_state(port, SNK_UNATTACHED, 0);
4245                 else
4246                         tcpm_set_state(port, SNK_STARTUP, 0);
4247                 break;
4248         case SNK_STARTUP:
4249                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
4250                                               port->cc2 : port->cc1);
4251                 typec_set_pwr_opmode(port->typec_port, opmode);
4252                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4253                 port->negotiated_rev = PD_MAX_REV;
4254                 port->message_id = 0;
4255                 port->rx_msgid = -1;
4256                 port->explicit_contract = false;
4257
4258                 if (port->ams == POWER_ROLE_SWAP ||
4259                     port->ams == FAST_ROLE_SWAP)
4260                         /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4261                         tcpm_ams_finish(port);
4262
4263                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4264                 break;
4265         case SNK_DISCOVERY:
4266                 if (port->vbus_present) {
4267                         u32 current_lim = tcpm_get_current_limit(port);
4268
4269                         if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4270                                 current_lim = PD_P_SNK_STDBY_MW / 5;
4271                         tcpm_set_current_limit(port, current_lim, 5000);
4272                         /* Not sink vbus if operational current is 0mA */
4273                         tcpm_set_charge(port, !port->pd_supported ||
4274                                         pdo_max_current(port->snk_pdo[0]));
4275
4276                         if (!port->pd_supported)
4277                                 tcpm_set_state(port, SNK_READY, 0);
4278                         else
4279                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4280                         break;
4281                 }
4282                 /*
4283                  * For DRP, timeouts differ. Also, handling is supposed to be
4284                  * different and much more complex (dead battery detection;
4285                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
4286                  */
4287                 tcpm_set_state(port, hard_reset_state(port),
4288                                port->port_type == TYPEC_PORT_DRP ?
4289                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4290                 break;
4291         case SNK_DISCOVERY_DEBOUNCE:
4292                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4293                                PD_T_CC_DEBOUNCE);
4294                 break;
4295         case SNK_DISCOVERY_DEBOUNCE_DONE:
4296                 if (!tcpm_port_is_disconnected(port) &&
4297                     tcpm_port_is_sink(port) &&
4298                     ktime_after(port->delayed_runtime, ktime_get())) {
4299                         tcpm_set_state(port, SNK_DISCOVERY,
4300                                        ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4301                         break;
4302                 }
4303                 tcpm_set_state(port, unattached_state(port), 0);
4304                 break;
4305         case SNK_WAIT_CAPABILITIES:
4306                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4307                 if (ret < 0) {
4308                         tcpm_set_state(port, SNK_READY, 0);
4309                         break;
4310                 }
4311                 /*
4312                  * If VBUS has never been low, and we time out waiting
4313                  * for source cap, try a soft reset first, in case we
4314                  * were already in a stable contract before this boot.
4315                  * Do this only once.
4316                  */
4317                 if (port->vbus_never_low) {
4318                         port->vbus_never_low = false;
4319                         tcpm_set_state(port, SNK_SOFT_RESET,
4320                                        PD_T_SINK_WAIT_CAP);
4321                 } else {
4322                         tcpm_set_state(port, hard_reset_state(port),
4323                                        PD_T_SINK_WAIT_CAP);
4324                 }
4325                 break;
4326         case SNK_NEGOTIATE_CAPABILITIES:
4327                 port->pd_capable = true;
4328                 tcpm_set_partner_usb_comm_capable(port,
4329                                                   !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4330                 port->hard_reset_count = 0;
4331                 ret = tcpm_pd_send_request(port);
4332                 if (ret < 0) {
4333                         /* Restore back to the original state */
4334                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4335                                                                port->pps_data.active,
4336                                                                port->supply_voltage);
4337                         /* Let the Source send capabilities again. */
4338                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4339                 } else {
4340                         tcpm_set_state_cond(port, hard_reset_state(port),
4341                                             PD_T_SENDER_RESPONSE);
4342                 }
4343                 break;
4344         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4345                 ret = tcpm_pd_send_pps_request(port);
4346                 if (ret < 0) {
4347                         /* Restore back to the original state */
4348                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4349                                                                port->pps_data.active,
4350                                                                port->supply_voltage);
4351                         port->pps_status = ret;
4352                         /*
4353                          * If this was called due to updates to sink
4354                          * capabilities, and pps is no longer valid, we should
4355                          * safely fall back to a standard PDO.
4356                          */
4357                         if (port->update_sink_caps)
4358                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4359                         else
4360                                 tcpm_set_state(port, SNK_READY, 0);
4361                 } else {
4362                         tcpm_set_state_cond(port, hard_reset_state(port),
4363                                             PD_T_SENDER_RESPONSE);
4364                 }
4365                 break;
4366         case SNK_TRANSITION_SINK:
4367                 /* From the USB PD spec:
4368                  * "The Sink Shall transition to Sink Standby before a positive or
4369                  * negative voltage transition of VBUS. During Sink Standby
4370                  * the Sink Shall reduce its power draw to pSnkStdby."
4371                  *
4372                  * This is not applicable to PPS though as the port can continue
4373                  * to draw negotiated power without switching to standby.
4374                  */
4375                 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4376                     port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4377                         u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4378
4379                         tcpm_log(port, "Setting standby current %u mV @ %u mA",
4380                                  port->supply_voltage, stdby_ma);
4381                         tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4382                 }
4383                 fallthrough;
4384         case SNK_TRANSITION_SINK_VBUS:
4385                 tcpm_set_state(port, hard_reset_state(port),
4386                                PD_T_PS_TRANSITION);
4387                 break;
4388         case SNK_READY:
4389                 port->try_snk_count = 0;
4390                 port->update_sink_caps = false;
4391                 if (port->explicit_contract) {
4392                         typec_set_pwr_opmode(port->typec_port,
4393                                              TYPEC_PWR_MODE_PD);
4394                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
4395                 }
4396
4397                 if (!port->pd_capable && port->slow_charger_loop)
4398                         tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4399                 tcpm_swap_complete(port, 0);
4400                 tcpm_typec_connect(port);
4401                 mod_enable_frs_delayed_work(port, 0);
4402                 tcpm_pps_complete(port, port->pps_status);
4403
4404                 if (port->ams != NONE_AMS)
4405                         tcpm_ams_finish(port);
4406                 if (port->next_ams != NONE_AMS) {
4407                         port->ams = port->next_ams;
4408                         port->next_ams = NONE_AMS;
4409                 }
4410
4411                 /*
4412                  * If previous AMS is interrupted, switch to the upcoming
4413                  * state.
4414                  */
4415                 if (port->upcoming_state != INVALID_STATE) {
4416                         upcoming_state = port->upcoming_state;
4417                         port->upcoming_state = INVALID_STATE;
4418                         tcpm_set_state(port, upcoming_state, 0);
4419                         break;
4420                 }
4421
4422                 /*
4423                  * 6.4.4.3.1 Discover Identity
4424                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4425                  * Explicit Contract."
4426                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4427                  * port->explicit_contract.
4428                  */
4429                 if (port->explicit_contract) {
4430                         tcpm_set_initial_svdm_version(port);
4431                         mod_send_discover_delayed_work(port, 0);
4432                 } else {
4433                         port->send_discover = false;
4434                 }
4435
4436                 power_supply_changed(port->psy);
4437                 break;
4438
4439         /* Accessory states */
4440         case ACC_UNATTACHED:
4441                 tcpm_acc_detach(port);
4442                 tcpm_set_state(port, SRC_UNATTACHED, 0);
4443                 break;
4444         case DEBUG_ACC_ATTACHED:
4445         case AUDIO_ACC_ATTACHED:
4446                 ret = tcpm_acc_attach(port);
4447                 if (ret < 0)
4448                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4449                 break;
4450         case AUDIO_ACC_DEBOUNCE:
4451                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4452                 break;
4453
4454         /* Hard_Reset states */
4455         case HARD_RESET_SEND:
4456                 if (port->ams != NONE_AMS)
4457                         tcpm_ams_finish(port);
4458                 /*
4459                  * State machine will be directed to HARD_RESET_START,
4460                  * thus set upcoming_state to INVALID_STATE.
4461                  */
4462                 port->upcoming_state = INVALID_STATE;
4463                 tcpm_ams_start(port, HARD_RESET);
4464                 break;
4465         case HARD_RESET_START:
4466                 port->sink_cap_done = false;
4467                 if (port->tcpc->enable_frs)
4468                         port->tcpc->enable_frs(port->tcpc, false);
4469                 port->hard_reset_count++;
4470                 port->tcpc->set_pd_rx(port->tcpc, false);
4471                 tcpm_unregister_altmodes(port);
4472                 port->nr_sink_caps = 0;
4473                 port->send_discover = true;
4474                 if (port->pwr_role == TYPEC_SOURCE)
4475                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4476                                        PD_T_PS_HARD_RESET);
4477                 else
4478                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4479                 break;
4480         case SRC_HARD_RESET_VBUS_OFF:
4481                 /*
4482                  * 7.1.5 Response to Hard Resets
4483                  * Hard Reset Signaling indicates a communication failure has occurred and the
4484                  * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4485                  * drive VBUS to vSafe0V as shown in Figure 7-9.
4486                  */
4487                 tcpm_set_vconn(port, false);
4488                 tcpm_set_vbus(port, false);
4489                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4490                                tcpm_data_role_for_source(port));
4491                 /*
4492                  * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4493                  * PD_T_SRC_RECOVER before turning vbus back on.
4494                  * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4495                  * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4496                  * tells the Device Policy Manager to instruct the power supply to perform a
4497                  * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4498                  * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4499                  * re-establish communication with the Sink and resume USB Default Operation.
4500                  * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4501                  */
4502                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4503                 break;
4504         case SRC_HARD_RESET_VBUS_ON:
4505                 tcpm_set_vconn(port, true);
4506                 tcpm_set_vbus(port, true);
4507                 if (port->ams == HARD_RESET)
4508                         tcpm_ams_finish(port);
4509                 if (port->pd_supported)
4510                         port->tcpc->set_pd_rx(port->tcpc, true);
4511                 tcpm_set_attached_state(port, true);
4512                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4513                 break;
4514         case SNK_HARD_RESET_SINK_OFF:
4515                 /* Do not discharge/disconnect during hard reseet */
4516                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4517                 memset(&port->pps_data, 0, sizeof(port->pps_data));
4518                 tcpm_set_vconn(port, false);
4519                 if (port->pd_capable)
4520                         tcpm_set_charge(port, false);
4521                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4522                                tcpm_data_role_for_sink(port));
4523                 /*
4524                  * VBUS may or may not toggle, depending on the adapter.
4525                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4526                  * directly after timeout.
4527                  */
4528                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4529                 break;
4530         case SNK_HARD_RESET_WAIT_VBUS:
4531                 if (port->ams == HARD_RESET)
4532                         tcpm_ams_finish(port);
4533                 /* Assume we're disconnected if VBUS doesn't come back. */
4534                 tcpm_set_state(port, SNK_UNATTACHED,
4535                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4536                 break;
4537         case SNK_HARD_RESET_SINK_ON:
4538                 /* Note: There is no guarantee that VBUS is on in this state */
4539                 /*
4540                  * XXX:
4541                  * The specification suggests that dual mode ports in sink
4542                  * mode should transition to state PE_SRC_Transition_to_default.
4543                  * See USB power delivery specification chapter 8.3.3.6.1.3.
4544                  * This would mean to
4545                  * - turn off VCONN, reset power supply
4546                  * - request hardware reset
4547                  * - turn on VCONN
4548                  * - Transition to state PE_Src_Startup
4549                  * SNK only ports shall transition to state Snk_Startup
4550                  * (see chapter 8.3.3.3.8).
4551                  * Similar, dual-mode ports in source mode should transition
4552                  * to PE_SNK_Transition_to_default.
4553                  */
4554                 if (port->pd_capable) {
4555                         tcpm_set_current_limit(port,
4556                                                tcpm_get_current_limit(port),
4557                                                5000);
4558                         /* Not sink vbus if operational current is 0mA */
4559                         tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
4560                 }
4561                 if (port->ams == HARD_RESET)
4562                         tcpm_ams_finish(port);
4563                 tcpm_set_attached_state(port, true);
4564                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4565                 tcpm_set_state(port, SNK_STARTUP, 0);
4566                 break;
4567
4568         /* Soft_Reset states */
4569         case SOFT_RESET:
4570                 port->message_id = 0;
4571                 port->rx_msgid = -1;
4572                 /* remove existing capabilities */
4573                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4574                 port->partner_source_caps = NULL;
4575                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4576                 tcpm_ams_finish(port);
4577                 if (port->pwr_role == TYPEC_SOURCE) {
4578                         port->upcoming_state = SRC_SEND_CAPABILITIES;
4579                         tcpm_ams_start(port, POWER_NEGOTIATION);
4580                 } else {
4581                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4582                 }
4583                 break;
4584         case SRC_SOFT_RESET_WAIT_SNK_TX:
4585         case SNK_SOFT_RESET:
4586                 if (port->ams != NONE_AMS)
4587                         tcpm_ams_finish(port);
4588                 port->upcoming_state = SOFT_RESET_SEND;
4589                 tcpm_ams_start(port, SOFT_RESET_AMS);
4590                 break;
4591         case SOFT_RESET_SEND:
4592                 port->message_id = 0;
4593                 port->rx_msgid = -1;
4594                 /* remove existing capabilities */
4595                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4596                 port->partner_source_caps = NULL;
4597                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4598                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
4599                 else
4600                         tcpm_set_state_cond(port, hard_reset_state(port),
4601                                             PD_T_SENDER_RESPONSE);
4602                 break;
4603
4604         /* DR_Swap states */
4605         case DR_SWAP_SEND:
4606                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4607                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4608                         port->send_discover = true;
4609                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4610                                     PD_T_SENDER_RESPONSE);
4611                 break;
4612         case DR_SWAP_ACCEPT:
4613                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4614                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4615                         port->send_discover = true;
4616                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4617                 break;
4618         case DR_SWAP_SEND_TIMEOUT:
4619                 tcpm_swap_complete(port, -ETIMEDOUT);
4620                 port->send_discover = false;
4621                 tcpm_ams_finish(port);
4622                 tcpm_set_state(port, ready_state(port), 0);
4623                 break;
4624         case DR_SWAP_CHANGE_DR:
4625                 tcpm_unregister_altmodes(port);
4626                 if (port->data_role == TYPEC_HOST)
4627                         tcpm_set_roles(port, true, port->pwr_role,
4628                                        TYPEC_DEVICE);
4629                 else
4630                         tcpm_set_roles(port, true, port->pwr_role,
4631                                        TYPEC_HOST);
4632                 tcpm_ams_finish(port);
4633                 tcpm_set_state(port, ready_state(port), 0);
4634                 break;
4635
4636         case FR_SWAP_SEND:
4637                 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4638                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4639                         break;
4640                 }
4641                 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4642                 break;
4643         case FR_SWAP_SEND_TIMEOUT:
4644                 tcpm_set_state(port, ERROR_RECOVERY, 0);
4645                 break;
4646         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4647                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4648                 break;
4649         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4650                 if (port->vbus_source)
4651                         tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4652                 else
4653                         tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4654                 break;
4655         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4656                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4657                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4658                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4659                         break;
4660                 }
4661                 tcpm_set_cc(port, tcpm_rp_cc(port));
4662                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4663                 break;
4664
4665         /* PR_Swap states */
4666         case PR_SWAP_ACCEPT:
4667                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4668                 tcpm_set_state(port, PR_SWAP_START, 0);
4669                 break;
4670         case PR_SWAP_SEND:
4671                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4672                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4673                                     PD_T_SENDER_RESPONSE);
4674                 break;
4675         case PR_SWAP_SEND_TIMEOUT:
4676                 tcpm_swap_complete(port, -ETIMEDOUT);
4677                 tcpm_set_state(port, ready_state(port), 0);
4678                 break;
4679         case PR_SWAP_START:
4680                 tcpm_apply_rc(port);
4681                 if (port->pwr_role == TYPEC_SOURCE)
4682                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4683                                        PD_T_SRC_TRANSITION);
4684                 else
4685                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4686                 break;
4687         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4688                 /*
4689                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4690                  * as this is not a disconnect.
4691                  */
4692                 tcpm_set_vbus(port, false);
4693                 port->explicit_contract = false;
4694                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4695                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4696                                PD_T_SRCSWAPSTDBY);
4697                 break;
4698         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4699                 tcpm_set_cc(port, TYPEC_CC_RD);
4700                 /* allow CC debounce */
4701                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4702                                PD_T_CC_DEBOUNCE);
4703                 break;
4704         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4705                 /*
4706                  * USB-PD standard, 6.2.1.4, Port Power Role:
4707                  * "During the Power Role Swap Sequence, for the initial Source
4708                  * Port, the Port Power Role field shall be set to Sink in the
4709                  * PS_RDY Message indicating that the initial Source’s power
4710                  * supply is turned off"
4711                  */
4712                 tcpm_set_pwr_role(port, TYPEC_SINK);
4713                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4714                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4715                         break;
4716                 }
4717                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4718                 break;
4719         case PR_SWAP_SRC_SNK_SINK_ON:
4720                 tcpm_enable_auto_vbus_discharge(port, true);
4721                 /* Set the vbus disconnect threshold for implicit contract */
4722                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4723                 tcpm_set_state(port, SNK_STARTUP, 0);
4724                 break;
4725         case PR_SWAP_SNK_SRC_SINK_OFF:
4726                 /* will be source, remove existing capabilities */
4727                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4728                 port->partner_source_caps = NULL;
4729                 /*
4730                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4731                  * as this is not a disconnect.
4732                  */
4733                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4734                                                        port->pps_data.active, 0);
4735                 tcpm_set_charge(port, false);
4736                 tcpm_set_state(port, hard_reset_state(port),
4737                                PD_T_PS_SOURCE_OFF);
4738                 break;
4739         case PR_SWAP_SNK_SRC_SOURCE_ON:
4740                 tcpm_enable_auto_vbus_discharge(port, true);
4741                 tcpm_set_cc(port, tcpm_rp_cc(port));
4742                 tcpm_set_vbus(port, true);
4743                 /*
4744                  * allow time VBUS ramp-up, must be < tNewSrc
4745                  * Also, this window overlaps with CC debounce as well.
4746                  * So, Wait for the max of two which is PD_T_NEWSRC
4747                  */
4748                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4749                                PD_T_NEWSRC);
4750                 break;
4751         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4752                 /*
4753                  * USB PD standard, 6.2.1.4:
4754                  * "Subsequent Messages initiated by the Policy Engine,
4755                  * such as the PS_RDY Message sent to indicate that Vbus
4756                  * is ready, will have the Port Power Role field set to
4757                  * Source."
4758                  */
4759                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4760                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4761                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4762                 break;
4763
4764         case VCONN_SWAP_ACCEPT:
4765                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4766                 tcpm_ams_finish(port);
4767                 tcpm_set_state(port, VCONN_SWAP_START, 0);
4768                 break;
4769         case VCONN_SWAP_SEND:
4770                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4771                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4772                                PD_T_SENDER_RESPONSE);
4773                 break;
4774         case VCONN_SWAP_SEND_TIMEOUT:
4775                 tcpm_swap_complete(port, -ETIMEDOUT);
4776                 tcpm_set_state(port, ready_state(port), 0);
4777                 break;
4778         case VCONN_SWAP_START:
4779                 if (port->vconn_role == TYPEC_SOURCE)
4780                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4781                 else
4782                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4783                 break;
4784         case VCONN_SWAP_WAIT_FOR_VCONN:
4785                 tcpm_set_state(port, hard_reset_state(port),
4786                                PD_T_VCONN_SOURCE_ON);
4787                 break;
4788         case VCONN_SWAP_TURN_ON_VCONN:
4789                 tcpm_set_vconn(port, true);
4790                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4791                 tcpm_set_state(port, ready_state(port), 0);
4792                 break;
4793         case VCONN_SWAP_TURN_OFF_VCONN:
4794                 tcpm_set_vconn(port, false);
4795                 tcpm_set_state(port, ready_state(port), 0);
4796                 break;
4797
4798         case DR_SWAP_CANCEL:
4799         case PR_SWAP_CANCEL:
4800         case VCONN_SWAP_CANCEL:
4801                 tcpm_swap_complete(port, port->swap_status);
4802                 if (port->pwr_role == TYPEC_SOURCE)
4803                         tcpm_set_state(port, SRC_READY, 0);
4804                 else
4805                         tcpm_set_state(port, SNK_READY, 0);
4806                 break;
4807         case FR_SWAP_CANCEL:
4808                 if (port->pwr_role == TYPEC_SOURCE)
4809                         tcpm_set_state(port, SRC_READY, 0);
4810                 else
4811                         tcpm_set_state(port, SNK_READY, 0);
4812                 break;
4813
4814         case BIST_RX:
4815                 switch (BDO_MODE_MASK(port->bist_request)) {
4816                 case BDO_MODE_CARRIER2:
4817                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4818                         tcpm_set_state(port, unattached_state(port),
4819                                        PD_T_BIST_CONT_MODE);
4820                         break;
4821                 case BDO_MODE_TESTDATA:
4822                         if (port->tcpc->set_bist_data) {
4823                                 tcpm_log(port, "Enable BIST MODE TESTDATA");
4824                                 port->tcpc->set_bist_data(port->tcpc, true);
4825                         }
4826                         break;
4827                 default:
4828                         break;
4829                 }
4830                 break;
4831         case GET_STATUS_SEND:
4832                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4833                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4834                                PD_T_SENDER_RESPONSE);
4835                 break;
4836         case GET_STATUS_SEND_TIMEOUT:
4837                 tcpm_set_state(port, ready_state(port), 0);
4838                 break;
4839         case GET_PPS_STATUS_SEND:
4840                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4841                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4842                                PD_T_SENDER_RESPONSE);
4843                 break;
4844         case GET_PPS_STATUS_SEND_TIMEOUT:
4845                 tcpm_set_state(port, ready_state(port), 0);
4846                 break;
4847         case GET_SINK_CAP:
4848                 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4849                 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4850                 break;
4851         case GET_SINK_CAP_TIMEOUT:
4852                 port->sink_cap_done = true;
4853                 tcpm_set_state(port, ready_state(port), 0);
4854                 break;
4855         case ERROR_RECOVERY:
4856                 tcpm_swap_complete(port, -EPROTO);
4857                 tcpm_pps_complete(port, -EPROTO);
4858                 tcpm_set_state(port, PORT_RESET, 0);
4859                 break;
4860         case PORT_RESET:
4861                 tcpm_reset_port(port);
4862                 tcpm_set_cc(port, tcpm_default_state(port) == SNK_UNATTACHED ?
4863                             TYPEC_CC_RD : tcpm_rp_cc(port));
4864                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4865                                PD_T_ERROR_RECOVERY);
4866                 break;
4867         case PORT_RESET_WAIT_OFF:
4868                 tcpm_set_state(port,
4869                                tcpm_default_state(port),
4870                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4871                 break;
4872
4873         /* AMS intermediate state */
4874         case AMS_START:
4875                 if (port->upcoming_state == INVALID_STATE) {
4876                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4877                                        SRC_READY : SNK_READY, 0);
4878                         break;
4879                 }
4880
4881                 upcoming_state = port->upcoming_state;
4882                 port->upcoming_state = INVALID_STATE;
4883                 tcpm_set_state(port, upcoming_state, 0);
4884                 break;
4885
4886         /* Chunk state */
4887         case CHUNK_NOT_SUPP:
4888                 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4889                 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4890                 break;
4891         default:
4892                 WARN(1, "Unexpected port state %d\n", port->state);
4893                 break;
4894         }
4895 }
4896
4897 static void tcpm_state_machine_work(struct kthread_work *work)
4898 {
4899         struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4900         enum tcpm_state prev_state;
4901
4902         mutex_lock(&port->lock);
4903         port->state_machine_running = true;
4904
4905         if (port->queued_message && tcpm_send_queued_message(port))
4906                 goto done;
4907
4908         /* If we were queued due to a delayed state change, update it now */
4909         if (port->delayed_state) {
4910                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4911                          tcpm_states[port->state],
4912                          tcpm_states[port->delayed_state], port->delay_ms);
4913                 port->prev_state = port->state;
4914                 port->state = port->delayed_state;
4915                 port->delayed_state = INVALID_STATE;
4916         }
4917
4918         /*
4919          * Continue running as long as we have (non-delayed) state changes
4920          * to make.
4921          */
4922         do {
4923                 prev_state = port->state;
4924                 run_state_machine(port);
4925                 if (port->queued_message)
4926                         tcpm_send_queued_message(port);
4927         } while (port->state != prev_state && !port->delayed_state);
4928
4929 done:
4930         port->state_machine_running = false;
4931         mutex_unlock(&port->lock);
4932 }
4933
4934 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4935                             enum typec_cc_status cc2)
4936 {
4937         enum typec_cc_status old_cc1, old_cc2;
4938         enum tcpm_state new_state;
4939
4940         old_cc1 = port->cc1;
4941         old_cc2 = port->cc2;
4942         port->cc1 = cc1;
4943         port->cc2 = cc2;
4944
4945         tcpm_log_force(port,
4946                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4947                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4948                        port->polarity,
4949                        tcpm_port_is_disconnected(port) ? "disconnected"
4950                                                        : "connected");
4951
4952         switch (port->state) {
4953         case TOGGLING:
4954                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4955                     tcpm_port_is_source(port))
4956                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4957                 else if (tcpm_port_is_sink(port))
4958                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4959                 break;
4960         case CHECK_CONTAMINANT:
4961                 /* Wait for Toggling to be resumed */
4962                 break;
4963         case SRC_UNATTACHED:
4964         case ACC_UNATTACHED:
4965                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4966                     tcpm_port_is_source(port))
4967                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4968                 break;
4969         case SRC_ATTACH_WAIT:
4970                 if (tcpm_port_is_disconnected(port) ||
4971                     tcpm_port_is_audio_detached(port))
4972                         tcpm_set_state(port, SRC_UNATTACHED, 0);
4973                 else if (cc1 != old_cc1 || cc2 != old_cc2)
4974                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4975                 break;
4976         case SRC_ATTACHED:
4977         case SRC_STARTUP:
4978         case SRC_SEND_CAPABILITIES:
4979         case SRC_READY:
4980                 if (tcpm_port_is_disconnected(port) ||
4981                     !tcpm_port_is_source(port)) {
4982                         if (port->port_type == TYPEC_PORT_SRC)
4983                                 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4984                         else
4985                                 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4986                 }
4987                 break;
4988         case SNK_UNATTACHED:
4989                 if (tcpm_port_is_sink(port))
4990                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4991                 break;
4992         case SNK_ATTACH_WAIT:
4993                 if ((port->cc1 == TYPEC_CC_OPEN &&
4994                      port->cc2 != TYPEC_CC_OPEN) ||
4995                     (port->cc1 != TYPEC_CC_OPEN &&
4996                      port->cc2 == TYPEC_CC_OPEN))
4997                         new_state = SNK_DEBOUNCED;
4998                 else if (tcpm_port_is_disconnected(port))
4999                         new_state = SNK_UNATTACHED;
5000                 else
5001                         break;
5002                 if (new_state != port->delayed_state)
5003                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
5004                 break;
5005         case SNK_DEBOUNCED:
5006                 if (tcpm_port_is_disconnected(port))
5007                         new_state = SNK_UNATTACHED;
5008                 else if (port->vbus_present)
5009                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
5010                 else
5011                         new_state = SNK_UNATTACHED;
5012                 if (new_state != port->delayed_state)
5013                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
5014                 break;
5015         case SNK_READY:
5016                 /*
5017                  * EXIT condition is based primarily on vbus disconnect and CC is secondary.
5018                  * "A port that has entered into USB PD communications with the Source and
5019                  * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
5020                  * cable disconnect in addition to monitoring VBUS.
5021                  *
5022                  * A port that is monitoring the CC voltage for disconnect (but is not in
5023                  * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
5024                  * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
5025                  * vRd-USB for tPDDebounce."
5026                  *
5027                  * When set_auto_vbus_discharge_threshold is enabled, CC pins go
5028                  * away before vbus decays to disconnect threshold. Allow
5029                  * disconnect to be driven by vbus disconnect when auto vbus
5030                  * discharge is enabled.
5031                  */
5032                 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
5033                         tcpm_set_state(port, unattached_state(port), 0);
5034                 else if (!port->pd_capable &&
5035                          (cc1 != old_cc1 || cc2 != old_cc2))
5036                         tcpm_set_current_limit(port,
5037                                                tcpm_get_current_limit(port),
5038                                                5000);
5039                 break;
5040
5041         case AUDIO_ACC_ATTACHED:
5042                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5043                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
5044                 break;
5045         case AUDIO_ACC_DEBOUNCE:
5046                 if (tcpm_port_is_audio(port))
5047                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
5048                 break;
5049
5050         case DEBUG_ACC_ATTACHED:
5051                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5052                         tcpm_set_state(port, ACC_UNATTACHED, 0);
5053                 break;
5054
5055         case SNK_TRY:
5056                 /* Do nothing, waiting for timeout */
5057                 break;
5058
5059         case SNK_DISCOVERY:
5060                 /* CC line is unstable, wait for debounce */
5061                 if (tcpm_port_is_disconnected(port))
5062                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
5063                 break;
5064         case SNK_DISCOVERY_DEBOUNCE:
5065                 break;
5066
5067         case SRC_TRYWAIT:
5068                 /* Hand over to state machine if needed */
5069                 if (!port->vbus_present && tcpm_port_is_source(port))
5070                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5071                 break;
5072         case SRC_TRYWAIT_DEBOUNCE:
5073                 if (port->vbus_present || !tcpm_port_is_source(port))
5074                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5075                 break;
5076         case SNK_TRY_WAIT_DEBOUNCE:
5077                 if (!tcpm_port_is_sink(port)) {
5078                         port->max_wait = 0;
5079                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5080                 }
5081                 break;
5082         case SRC_TRY_WAIT:
5083                 if (tcpm_port_is_source(port))
5084                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
5085                 break;
5086         case SRC_TRY_DEBOUNCE:
5087                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
5088                 break;
5089         case SNK_TRYWAIT_DEBOUNCE:
5090                 if (tcpm_port_is_sink(port))
5091                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
5092                 break;
5093         case SNK_TRYWAIT_VBUS:
5094                 if (!tcpm_port_is_sink(port))
5095                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
5096                 break;
5097         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5098                 if (!tcpm_port_is_sink(port))
5099                         tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
5100                 else
5101                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
5102                 break;
5103         case SNK_TRYWAIT:
5104                 /* Do nothing, waiting for tCCDebounce */
5105                 break;
5106         case PR_SWAP_SNK_SRC_SINK_OFF:
5107         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5108         case PR_SWAP_SRC_SNK_SOURCE_OFF:
5109         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
5110         case PR_SWAP_SNK_SRC_SOURCE_ON:
5111                 /*
5112                  * CC state change is expected in PR_SWAP
5113                  * Ignore it.
5114                  */
5115                 break;
5116         case FR_SWAP_SEND:
5117         case FR_SWAP_SEND_TIMEOUT:
5118         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5119         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5120         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5121                 /* Do nothing, CC change expected */
5122                 break;
5123
5124         case PORT_RESET:
5125         case PORT_RESET_WAIT_OFF:
5126                 /*
5127                  * State set back to default mode once the timer completes.
5128                  * Ignore CC changes here.
5129                  */
5130                 break;
5131         default:
5132                 /*
5133                  * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5134                  * to be driven by vbus disconnect.
5135                  */
5136                 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5137                                                          port->auto_vbus_discharge_enabled))
5138                         tcpm_set_state(port, unattached_state(port), 0);
5139                 break;
5140         }
5141 }
5142
5143 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5144 {
5145         tcpm_log_force(port, "VBUS on");
5146         port->vbus_present = true;
5147         /*
5148          * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5149          * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5150          */
5151         port->vbus_vsafe0v = false;
5152
5153         switch (port->state) {
5154         case SNK_TRANSITION_SINK_VBUS:
5155                 port->explicit_contract = true;
5156                 tcpm_set_state(port, SNK_READY, 0);
5157                 break;
5158         case SNK_DISCOVERY:
5159                 tcpm_set_state(port, SNK_DISCOVERY, 0);
5160                 break;
5161
5162         case SNK_DEBOUNCED:
5163                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5164                                                         : SNK_ATTACHED,
5165                                        0);
5166                 break;
5167         case SNK_HARD_RESET_WAIT_VBUS:
5168                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5169                 break;
5170         case SRC_ATTACHED:
5171                 tcpm_set_state(port, SRC_STARTUP, 0);
5172                 break;
5173         case SRC_HARD_RESET_VBUS_ON:
5174                 tcpm_set_state(port, SRC_STARTUP, 0);
5175                 break;
5176
5177         case SNK_TRY:
5178                 /* Do nothing, waiting for timeout */
5179                 break;
5180         case SRC_TRYWAIT:
5181                 /* Do nothing, Waiting for Rd to be detected */
5182                 break;
5183         case SRC_TRYWAIT_DEBOUNCE:
5184                 tcpm_set_state(port, SRC_TRYWAIT, 0);
5185                 break;
5186         case SNK_TRY_WAIT_DEBOUNCE:
5187                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5188                 break;
5189         case SNK_TRYWAIT:
5190                 /* Do nothing, waiting for tCCDebounce */
5191                 break;
5192         case SNK_TRYWAIT_VBUS:
5193                 if (tcpm_port_is_sink(port))
5194                         tcpm_set_state(port, SNK_ATTACHED, 0);
5195                 break;
5196         case SNK_TRYWAIT_DEBOUNCE:
5197                 /* Do nothing, waiting for Rp */
5198                 break;
5199         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5200                 if (port->vbus_present && tcpm_port_is_sink(port))
5201                         tcpm_set_state(port, SNK_ATTACHED, 0);
5202                 break;
5203         case SRC_TRY_WAIT:
5204         case SRC_TRY_DEBOUNCE:
5205                 /* Do nothing, waiting for sink detection */
5206                 break;
5207         case FR_SWAP_SEND:
5208         case FR_SWAP_SEND_TIMEOUT:
5209         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5210         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5211                 if (port->tcpc->frs_sourcing_vbus)
5212                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5213                 break;
5214         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5215                 if (port->tcpc->frs_sourcing_vbus)
5216                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5217                 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5218                 break;
5219
5220         case PORT_RESET:
5221         case PORT_RESET_WAIT_OFF:
5222                 /*
5223                  * State set back to default mode once the timer completes.
5224                  * Ignore vbus changes here.
5225                  */
5226                 break;
5227
5228         default:
5229                 break;
5230         }
5231 }
5232
5233 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5234 {
5235         tcpm_log_force(port, "VBUS off");
5236         port->vbus_present = false;
5237         port->vbus_never_low = false;
5238         switch (port->state) {
5239         case SNK_HARD_RESET_SINK_OFF:
5240                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5241                 break;
5242         case HARD_RESET_SEND:
5243                 break;
5244         case SNK_TRY:
5245                 /* Do nothing, waiting for timeout */
5246                 break;
5247         case SRC_TRYWAIT:
5248                 /* Hand over to state machine if needed */
5249                 if (tcpm_port_is_source(port))
5250                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5251                 break;
5252         case SNK_TRY_WAIT_DEBOUNCE:
5253                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5254                 break;
5255         case SNK_TRYWAIT:
5256         case SNK_TRYWAIT_VBUS:
5257         case SNK_TRYWAIT_DEBOUNCE:
5258                 break;
5259         case SNK_ATTACH_WAIT:
5260         case SNK_DEBOUNCED:
5261                 /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
5262                 break;
5263
5264         case SNK_NEGOTIATE_CAPABILITIES:
5265                 break;
5266
5267         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5268                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5269                 break;
5270
5271         case PR_SWAP_SNK_SRC_SINK_OFF:
5272                 /* Do nothing, expected */
5273                 break;
5274
5275         case PR_SWAP_SNK_SRC_SOURCE_ON:
5276                 /*
5277                  * Do nothing when vbus off notification is received.
5278                  * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5279                  * for the vbus source to ramp up.
5280                  */
5281                 break;
5282
5283         case PORT_RESET_WAIT_OFF:
5284                 tcpm_set_state(port, tcpm_default_state(port), 0);
5285                 break;
5286
5287         case SRC_TRY_WAIT:
5288         case SRC_TRY_DEBOUNCE:
5289                 /* Do nothing, waiting for sink detection */
5290                 break;
5291
5292         case SRC_STARTUP:
5293         case SRC_SEND_CAPABILITIES:
5294         case SRC_SEND_CAPABILITIES_TIMEOUT:
5295         case SRC_NEGOTIATE_CAPABILITIES:
5296         case SRC_TRANSITION_SUPPLY:
5297         case SRC_READY:
5298         case SRC_WAIT_NEW_CAPABILITIES:
5299                 /*
5300                  * Force to unattached state to re-initiate connection.
5301                  * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5302                  * sink removed. Although sink removal here is due to source's vbus collapse,
5303                  * treat it the same way for consistency.
5304                  */
5305                 if (port->port_type == TYPEC_PORT_SRC)
5306                         tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5307                 else
5308                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5309                 break;
5310
5311         case PORT_RESET:
5312                 /*
5313                  * State set back to default mode once the timer completes.
5314                  * Ignore vbus changes here.
5315                  */
5316                 break;
5317
5318         case FR_SWAP_SEND:
5319         case FR_SWAP_SEND_TIMEOUT:
5320         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5321         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5322         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5323                 /* Do nothing, vbus drop expected */
5324                 break;
5325
5326         case SNK_HARD_RESET_WAIT_VBUS:
5327                 /* Do nothing, its OK to receive vbus off events */
5328                 break;
5329
5330         default:
5331                 if (port->pwr_role == TYPEC_SINK && port->attached)
5332                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5333                 break;
5334         }
5335 }
5336
5337 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5338 {
5339         tcpm_log_force(port, "VBUS VSAFE0V");
5340         port->vbus_vsafe0v = true;
5341         switch (port->state) {
5342         case SRC_HARD_RESET_VBUS_OFF:
5343                 /*
5344                  * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5345                  * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5346                  */
5347                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5348                 break;
5349         case SRC_ATTACH_WAIT:
5350                 if (tcpm_port_is_source(port))
5351                         tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5352                                        PD_T_CC_DEBOUNCE);
5353                 break;
5354         case SRC_STARTUP:
5355         case SRC_SEND_CAPABILITIES:
5356         case SRC_SEND_CAPABILITIES_TIMEOUT:
5357         case SRC_NEGOTIATE_CAPABILITIES:
5358         case SRC_TRANSITION_SUPPLY:
5359         case SRC_READY:
5360         case SRC_WAIT_NEW_CAPABILITIES:
5361                 if (port->auto_vbus_discharge_enabled) {
5362                         if (port->port_type == TYPEC_PORT_SRC)
5363                                 tcpm_set_state(port, SRC_UNATTACHED, 0);
5364                         else
5365                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5366                 }
5367                 break;
5368         case PR_SWAP_SNK_SRC_SINK_OFF:
5369         case PR_SWAP_SNK_SRC_SOURCE_ON:
5370                 /* Do nothing, vsafe0v is expected during transition */
5371                 break;
5372         case SNK_ATTACH_WAIT:
5373         case SNK_DEBOUNCED:
5374                 /*Do nothing, still waiting for VSAFE5V for connect */
5375                 break;
5376         case SNK_HARD_RESET_WAIT_VBUS:
5377                 /* Do nothing, its OK to receive vbus off events */
5378                 break;
5379         default:
5380                 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5381                         tcpm_set_state(port, SNK_UNATTACHED, 0);
5382                 break;
5383         }
5384 }
5385
5386 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5387 {
5388         tcpm_log_force(port, "Received hard reset");
5389         if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5390                 port->tcpc->set_bist_data(port->tcpc, false);
5391
5392         switch (port->state) {
5393         case ERROR_RECOVERY:
5394         case PORT_RESET:
5395         case PORT_RESET_WAIT_OFF:
5396                 return;
5397         default:
5398                 break;
5399         }
5400
5401         if (port->ams != NONE_AMS)
5402                 port->ams = NONE_AMS;
5403         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5404                 port->ams = HARD_RESET;
5405         /*
5406          * If we keep receiving hard reset requests, executing the hard reset
5407          * must have failed. Revert to error recovery if that happens.
5408          */
5409         tcpm_set_state(port,
5410                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5411                                 HARD_RESET_START : ERROR_RECOVERY,
5412                        0);
5413 }
5414
5415 static void tcpm_pd_event_handler(struct kthread_work *work)
5416 {
5417         struct tcpm_port *port = container_of(work, struct tcpm_port,
5418                                               event_work);
5419         u32 events;
5420
5421         mutex_lock(&port->lock);
5422
5423         spin_lock(&port->pd_event_lock);
5424         while (port->pd_events) {
5425                 events = port->pd_events;
5426                 port->pd_events = 0;
5427                 spin_unlock(&port->pd_event_lock);
5428                 if (events & TCPM_RESET_EVENT)
5429                         _tcpm_pd_hard_reset(port);
5430                 if (events & TCPM_VBUS_EVENT) {
5431                         bool vbus;
5432
5433                         vbus = port->tcpc->get_vbus(port->tcpc);
5434                         if (vbus) {
5435                                 _tcpm_pd_vbus_on(port);
5436                         } else {
5437                                 _tcpm_pd_vbus_off(port);
5438                                 /*
5439                                  * When TCPC does not support detecting vsafe0v voltage level,
5440                                  * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5441                                  * to see if vbus has discharge to VSAFE0V.
5442                                  */
5443                                 if (!port->tcpc->is_vbus_vsafe0v ||
5444                                     port->tcpc->is_vbus_vsafe0v(port->tcpc))
5445                                         _tcpm_pd_vbus_vsafe0v(port);
5446                         }
5447                 }
5448                 if (events & TCPM_CC_EVENT) {
5449                         enum typec_cc_status cc1, cc2;
5450
5451                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5452                                 _tcpm_cc_change(port, cc1, cc2);
5453                 }
5454                 if (events & TCPM_FRS_EVENT) {
5455                         if (port->state == SNK_READY) {
5456                                 int ret;
5457
5458                                 port->upcoming_state = FR_SWAP_SEND;
5459                                 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5460                                 if (ret == -EAGAIN)
5461                                         port->upcoming_state = INVALID_STATE;
5462                         } else {
5463                                 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5464                         }
5465                 }
5466                 if (events & TCPM_SOURCING_VBUS) {
5467                         tcpm_log(port, "sourcing vbus");
5468                         /*
5469                          * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5470                          * true as TCPM wouldn't have called tcpm_set_vbus.
5471                          *
5472                          * When vbus is sourced on the command on TCPM i.e. TCPM called
5473                          * tcpm_set_vbus to source vbus, vbus_source would already be true.
5474                          */
5475                         port->vbus_source = true;
5476                         _tcpm_pd_vbus_on(port);
5477                 }
5478                 if (events & TCPM_PORT_CLEAN) {
5479                         tcpm_log(port, "port clean");
5480                         if (port->state == CHECK_CONTAMINANT) {
5481                                 if (tcpm_start_toggling(port, tcpm_rp_cc(port)))
5482                                         tcpm_set_state(port, TOGGLING, 0);
5483                                 else
5484                                         tcpm_set_state(port, tcpm_default_state(port), 0);
5485                         }
5486                 }
5487
5488                 spin_lock(&port->pd_event_lock);
5489         }
5490         spin_unlock(&port->pd_event_lock);
5491         mutex_unlock(&port->lock);
5492 }
5493
5494 void tcpm_cc_change(struct tcpm_port *port)
5495 {
5496         spin_lock(&port->pd_event_lock);
5497         port->pd_events |= TCPM_CC_EVENT;
5498         spin_unlock(&port->pd_event_lock);
5499         kthread_queue_work(port->wq, &port->event_work);
5500 }
5501 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5502
5503 void tcpm_vbus_change(struct tcpm_port *port)
5504 {
5505         spin_lock(&port->pd_event_lock);
5506         port->pd_events |= TCPM_VBUS_EVENT;
5507         spin_unlock(&port->pd_event_lock);
5508         kthread_queue_work(port->wq, &port->event_work);
5509 }
5510 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5511
5512 void tcpm_pd_hard_reset(struct tcpm_port *port)
5513 {
5514         spin_lock(&port->pd_event_lock);
5515         port->pd_events = TCPM_RESET_EVENT;
5516         spin_unlock(&port->pd_event_lock);
5517         kthread_queue_work(port->wq, &port->event_work);
5518 }
5519 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5520
5521 void tcpm_sink_frs(struct tcpm_port *port)
5522 {
5523         spin_lock(&port->pd_event_lock);
5524         port->pd_events |= TCPM_FRS_EVENT;
5525         spin_unlock(&port->pd_event_lock);
5526         kthread_queue_work(port->wq, &port->event_work);
5527 }
5528 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5529
5530 void tcpm_sourcing_vbus(struct tcpm_port *port)
5531 {
5532         spin_lock(&port->pd_event_lock);
5533         port->pd_events |= TCPM_SOURCING_VBUS;
5534         spin_unlock(&port->pd_event_lock);
5535         kthread_queue_work(port->wq, &port->event_work);
5536 }
5537 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5538
5539 void tcpm_port_clean(struct tcpm_port *port)
5540 {
5541         spin_lock(&port->pd_event_lock);
5542         port->pd_events |= TCPM_PORT_CLEAN;
5543         spin_unlock(&port->pd_event_lock);
5544         kthread_queue_work(port->wq, &port->event_work);
5545 }
5546 EXPORT_SYMBOL_GPL(tcpm_port_clean);
5547
5548 bool tcpm_port_is_toggling(struct tcpm_port *port)
5549 {
5550         return port->port_type == TYPEC_PORT_DRP && port->state == TOGGLING;
5551 }
5552 EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
5553
5554 static void tcpm_enable_frs_work(struct kthread_work *work)
5555 {
5556         struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5557         int ret;
5558
5559         mutex_lock(&port->lock);
5560         /* Not FRS capable */
5561         if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5562             port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5563             !port->tcpc->enable_frs ||
5564             /* Sink caps queried */
5565             port->sink_cap_done || port->negotiated_rev < PD_REV30)
5566                 goto unlock;
5567
5568         /* Send when the state machine is idle */
5569         if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5570                 goto resched;
5571
5572         port->upcoming_state = GET_SINK_CAP;
5573         ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5574         if (ret == -EAGAIN) {
5575                 port->upcoming_state = INVALID_STATE;
5576         } else {
5577                 port->sink_cap_done = true;
5578                 goto unlock;
5579         }
5580 resched:
5581         mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5582 unlock:
5583         mutex_unlock(&port->lock);
5584 }
5585
5586 static void tcpm_send_discover_work(struct kthread_work *work)
5587 {
5588         struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5589
5590         mutex_lock(&port->lock);
5591         /* No need to send DISCOVER_IDENTITY anymore */
5592         if (!port->send_discover)
5593                 goto unlock;
5594
5595         if (port->data_role == TYPEC_DEVICE && port->negotiated_rev < PD_REV30) {
5596                 port->send_discover = false;
5597                 goto unlock;
5598         }
5599
5600         /* Retry if the port is not idle */
5601         if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5602                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5603                 goto unlock;
5604         }
5605
5606         tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5607
5608 unlock:
5609         mutex_unlock(&port->lock);
5610 }
5611
5612 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5613 {
5614         struct tcpm_port *port = typec_get_drvdata(p);
5615         int ret;
5616
5617         mutex_lock(&port->swap_lock);
5618         mutex_lock(&port->lock);
5619
5620         if (port->typec_caps.data != TYPEC_PORT_DRD) {
5621                 ret = -EINVAL;
5622                 goto port_unlock;
5623         }
5624         if (port->state != SRC_READY && port->state != SNK_READY) {
5625                 ret = -EAGAIN;
5626                 goto port_unlock;
5627         }
5628
5629         if (port->data_role == data) {
5630                 ret = 0;
5631                 goto port_unlock;
5632         }
5633
5634         /*
5635          * XXX
5636          * 6.3.9: If an alternate mode is active, a request to swap
5637          * alternate modes shall trigger a port reset.
5638          * Reject data role swap request in this case.
5639          */
5640
5641         if (!port->pd_capable) {
5642                 /*
5643                  * If the partner is not PD capable, reset the port to
5644                  * trigger a role change. This can only work if a preferred
5645                  * role is configured, and if it matches the requested role.
5646                  */
5647                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5648                     port->try_role == port->pwr_role) {
5649                         ret = -EINVAL;
5650                         goto port_unlock;
5651                 }
5652                 port->non_pd_role_swap = true;
5653                 tcpm_set_state(port, PORT_RESET, 0);
5654         } else {
5655                 port->upcoming_state = DR_SWAP_SEND;
5656                 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5657                 if (ret == -EAGAIN) {
5658                         port->upcoming_state = INVALID_STATE;
5659                         goto port_unlock;
5660                 }
5661         }
5662
5663         port->swap_status = 0;
5664         port->swap_pending = true;
5665         reinit_completion(&port->swap_complete);
5666         mutex_unlock(&port->lock);
5667
5668         if (!wait_for_completion_timeout(&port->swap_complete,
5669                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5670                 ret = -ETIMEDOUT;
5671         else
5672                 ret = port->swap_status;
5673
5674         port->non_pd_role_swap = false;
5675         goto swap_unlock;
5676
5677 port_unlock:
5678         mutex_unlock(&port->lock);
5679 swap_unlock:
5680         mutex_unlock(&port->swap_lock);
5681         return ret;
5682 }
5683
5684 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5685 {
5686         struct tcpm_port *port = typec_get_drvdata(p);
5687         int ret;
5688
5689         mutex_lock(&port->swap_lock);
5690         mutex_lock(&port->lock);
5691
5692         if (port->port_type != TYPEC_PORT_DRP) {
5693                 ret = -EINVAL;
5694                 goto port_unlock;
5695         }
5696         if (port->state != SRC_READY && port->state != SNK_READY) {
5697                 ret = -EAGAIN;
5698                 goto port_unlock;
5699         }
5700
5701         if (role == port->pwr_role) {
5702                 ret = 0;
5703                 goto port_unlock;
5704         }
5705
5706         port->upcoming_state = PR_SWAP_SEND;
5707         ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5708         if (ret == -EAGAIN) {
5709                 port->upcoming_state = INVALID_STATE;
5710                 goto port_unlock;
5711         }
5712
5713         port->swap_status = 0;
5714         port->swap_pending = true;
5715         reinit_completion(&port->swap_complete);
5716         mutex_unlock(&port->lock);
5717
5718         if (!wait_for_completion_timeout(&port->swap_complete,
5719                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5720                 ret = -ETIMEDOUT;
5721         else
5722                 ret = port->swap_status;
5723
5724         goto swap_unlock;
5725
5726 port_unlock:
5727         mutex_unlock(&port->lock);
5728 swap_unlock:
5729         mutex_unlock(&port->swap_lock);
5730         return ret;
5731 }
5732
5733 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5734 {
5735         struct tcpm_port *port = typec_get_drvdata(p);
5736         int ret;
5737
5738         mutex_lock(&port->swap_lock);
5739         mutex_lock(&port->lock);
5740
5741         if (port->state != SRC_READY && port->state != SNK_READY) {
5742                 ret = -EAGAIN;
5743                 goto port_unlock;
5744         }
5745
5746         if (role == port->vconn_role) {
5747                 ret = 0;
5748                 goto port_unlock;
5749         }
5750
5751         port->upcoming_state = VCONN_SWAP_SEND;
5752         ret = tcpm_ams_start(port, VCONN_SWAP);
5753         if (ret == -EAGAIN) {
5754                 port->upcoming_state = INVALID_STATE;
5755                 goto port_unlock;
5756         }
5757
5758         port->swap_status = 0;
5759         port->swap_pending = true;
5760         reinit_completion(&port->swap_complete);
5761         mutex_unlock(&port->lock);
5762
5763         if (!wait_for_completion_timeout(&port->swap_complete,
5764                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5765                 ret = -ETIMEDOUT;
5766         else
5767                 ret = port->swap_status;
5768
5769         goto swap_unlock;
5770
5771 port_unlock:
5772         mutex_unlock(&port->lock);
5773 swap_unlock:
5774         mutex_unlock(&port->swap_lock);
5775         return ret;
5776 }
5777
5778 static int tcpm_try_role(struct typec_port *p, int role)
5779 {
5780         struct tcpm_port *port = typec_get_drvdata(p);
5781         struct tcpc_dev *tcpc = port->tcpc;
5782         int ret = 0;
5783
5784         mutex_lock(&port->lock);
5785         if (tcpc->try_role)
5786                 ret = tcpc->try_role(tcpc, role);
5787         if (!ret)
5788                 port->try_role = role;
5789         port->try_src_count = 0;
5790         port->try_snk_count = 0;
5791         mutex_unlock(&port->lock);
5792
5793         return ret;
5794 }
5795
5796 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5797 {
5798         unsigned int target_mw;
5799         int ret;
5800
5801         mutex_lock(&port->swap_lock);
5802         mutex_lock(&port->lock);
5803
5804         if (!port->pps_data.active) {
5805                 ret = -EOPNOTSUPP;
5806                 goto port_unlock;
5807         }
5808
5809         if (port->state != SNK_READY) {
5810                 ret = -EAGAIN;
5811                 goto port_unlock;
5812         }
5813
5814         if (req_op_curr > port->pps_data.max_curr) {
5815                 ret = -EINVAL;
5816                 goto port_unlock;
5817         }
5818
5819         target_mw = (req_op_curr * port->supply_voltage) / 1000;
5820         if (target_mw < port->operating_snk_mw) {
5821                 ret = -EINVAL;
5822                 goto port_unlock;
5823         }
5824
5825         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5826         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5827         if (ret == -EAGAIN) {
5828                 port->upcoming_state = INVALID_STATE;
5829                 goto port_unlock;
5830         }
5831
5832         /* Round down operating current to align with PPS valid steps */
5833         req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5834
5835         reinit_completion(&port->pps_complete);
5836         port->pps_data.req_op_curr = req_op_curr;
5837         port->pps_status = 0;
5838         port->pps_pending = true;
5839         mutex_unlock(&port->lock);
5840
5841         if (!wait_for_completion_timeout(&port->pps_complete,
5842                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5843                 ret = -ETIMEDOUT;
5844         else
5845                 ret = port->pps_status;
5846
5847         goto swap_unlock;
5848
5849 port_unlock:
5850         mutex_unlock(&port->lock);
5851 swap_unlock:
5852         mutex_unlock(&port->swap_lock);
5853
5854         return ret;
5855 }
5856
5857 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5858 {
5859         unsigned int target_mw;
5860         int ret;
5861
5862         mutex_lock(&port->swap_lock);
5863         mutex_lock(&port->lock);
5864
5865         if (!port->pps_data.active) {
5866                 ret = -EOPNOTSUPP;
5867                 goto port_unlock;
5868         }
5869
5870         if (port->state != SNK_READY) {
5871                 ret = -EAGAIN;
5872                 goto port_unlock;
5873         }
5874
5875         target_mw = (port->current_limit * req_out_volt) / 1000;
5876         if (target_mw < port->operating_snk_mw) {
5877                 ret = -EINVAL;
5878                 goto port_unlock;
5879         }
5880
5881         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5882         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5883         if (ret == -EAGAIN) {
5884                 port->upcoming_state = INVALID_STATE;
5885                 goto port_unlock;
5886         }
5887
5888         /* Round down output voltage to align with PPS valid steps */
5889         req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5890
5891         reinit_completion(&port->pps_complete);
5892         port->pps_data.req_out_volt = req_out_volt;
5893         port->pps_status = 0;
5894         port->pps_pending = true;
5895         mutex_unlock(&port->lock);
5896
5897         if (!wait_for_completion_timeout(&port->pps_complete,
5898                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5899                 ret = -ETIMEDOUT;
5900         else
5901                 ret = port->pps_status;
5902
5903         goto swap_unlock;
5904
5905 port_unlock:
5906         mutex_unlock(&port->lock);
5907 swap_unlock:
5908         mutex_unlock(&port->swap_lock);
5909
5910         return ret;
5911 }
5912
5913 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5914 {
5915         int ret = 0;
5916
5917         mutex_lock(&port->swap_lock);
5918         mutex_lock(&port->lock);
5919
5920         if (!port->pps_data.supported) {
5921                 ret = -EOPNOTSUPP;
5922                 goto port_unlock;
5923         }
5924
5925         /* Trying to deactivate PPS when already deactivated so just bail */
5926         if (!port->pps_data.active && !activate)
5927                 goto port_unlock;
5928
5929         if (port->state != SNK_READY) {
5930                 ret = -EAGAIN;
5931                 goto port_unlock;
5932         }
5933
5934         if (activate)
5935                 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5936         else
5937                 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5938         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5939         if (ret == -EAGAIN) {
5940                 port->upcoming_state = INVALID_STATE;
5941                 goto port_unlock;
5942         }
5943
5944         reinit_completion(&port->pps_complete);
5945         port->pps_status = 0;
5946         port->pps_pending = true;
5947
5948         /* Trigger PPS request or move back to standard PDO contract */
5949         if (activate) {
5950                 port->pps_data.req_out_volt = port->supply_voltage;
5951                 port->pps_data.req_op_curr = port->current_limit;
5952         }
5953         mutex_unlock(&port->lock);
5954
5955         if (!wait_for_completion_timeout(&port->pps_complete,
5956                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5957                 ret = -ETIMEDOUT;
5958         else
5959                 ret = port->pps_status;
5960
5961         goto swap_unlock;
5962
5963 port_unlock:
5964         mutex_unlock(&port->lock);
5965 swap_unlock:
5966         mutex_unlock(&port->swap_lock);
5967
5968         return ret;
5969 }
5970
5971 static void tcpm_init(struct tcpm_port *port)
5972 {
5973         enum typec_cc_status cc1, cc2;
5974
5975         port->tcpc->init(port->tcpc);
5976
5977         tcpm_reset_port(port);
5978
5979         /*
5980          * XXX
5981          * Should possibly wait for VBUS to settle if it was enabled locally
5982          * since tcpm_reset_port() will disable VBUS.
5983          */
5984         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5985         if (port->vbus_present)
5986                 port->vbus_never_low = true;
5987
5988         /*
5989          * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5990          * So implicitly vbus_vsafe0v = false.
5991          *
5992          * 2. When vbus_present is false and TCPC does NOT support querying
5993          * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5994          * vbus_vsafe0v is true.
5995          *
5996          * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5997          * then, query tcpc for vsafe0v status.
5998          */
5999         if (port->vbus_present)
6000                 port->vbus_vsafe0v = false;
6001         else if (!port->tcpc->is_vbus_vsafe0v)
6002                 port->vbus_vsafe0v = true;
6003         else
6004                 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
6005
6006         tcpm_set_state(port, tcpm_default_state(port), 0);
6007
6008         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
6009                 _tcpm_cc_change(port, cc1, cc2);
6010
6011         /*
6012          * Some adapters need a clean slate at startup, and won't recover
6013          * otherwise. So do not try to be fancy and force a clean disconnect.
6014          */
6015         tcpm_set_state(port, PORT_RESET, 0);
6016 }
6017
6018 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
6019 {
6020         struct tcpm_port *port = typec_get_drvdata(p);
6021
6022         mutex_lock(&port->lock);
6023         if (type == port->port_type)
6024                 goto port_unlock;
6025
6026         port->port_type = type;
6027
6028         if (!port->connected) {
6029                 tcpm_set_state(port, PORT_RESET, 0);
6030         } else if (type == TYPEC_PORT_SNK) {
6031                 if (!(port->pwr_role == TYPEC_SINK &&
6032                       port->data_role == TYPEC_DEVICE))
6033                         tcpm_set_state(port, PORT_RESET, 0);
6034         } else if (type == TYPEC_PORT_SRC) {
6035                 if (!(port->pwr_role == TYPEC_SOURCE &&
6036                       port->data_role == TYPEC_HOST))
6037                         tcpm_set_state(port, PORT_RESET, 0);
6038         }
6039
6040 port_unlock:
6041         mutex_unlock(&port->lock);
6042         return 0;
6043 }
6044
6045 static const struct typec_operations tcpm_ops = {
6046         .try_role = tcpm_try_role,
6047         .dr_set = tcpm_dr_set,
6048         .pr_set = tcpm_pr_set,
6049         .vconn_set = tcpm_vconn_set,
6050         .port_type_set = tcpm_port_type_set
6051 };
6052
6053 void tcpm_tcpc_reset(struct tcpm_port *port)
6054 {
6055         mutex_lock(&port->lock);
6056         /* XXX: Maintain PD connection if possible? */
6057         tcpm_init(port);
6058         mutex_unlock(&port->lock);
6059 }
6060 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
6061
6062 static void tcpm_port_unregister_pd(struct tcpm_port *port)
6063 {
6064         usb_power_delivery_unregister_capabilities(port->port_sink_caps);
6065         port->port_sink_caps = NULL;
6066         usb_power_delivery_unregister_capabilities(port->port_source_caps);
6067         port->port_source_caps = NULL;
6068         usb_power_delivery_unregister(port->pd);
6069         port->pd = NULL;
6070 }
6071
6072 static int tcpm_port_register_pd(struct tcpm_port *port)
6073 {
6074         struct usb_power_delivery_desc desc = { port->typec_caps.pd_revision };
6075         struct usb_power_delivery_capabilities_desc caps = { };
6076         struct usb_power_delivery_capabilities *cap;
6077         int ret;
6078
6079         if (!port->nr_src_pdo && !port->nr_snk_pdo)
6080                 return 0;
6081
6082         port->pd = usb_power_delivery_register(port->dev, &desc);
6083         if (IS_ERR(port->pd)) {
6084                 ret = PTR_ERR(port->pd);
6085                 goto err_unregister;
6086         }
6087
6088         if (port->nr_src_pdo) {
6089                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->src_pdo,
6090                                port->nr_src_pdo * sizeof(u32), 0);
6091                 caps.role = TYPEC_SOURCE;
6092
6093                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6094                 if (IS_ERR(cap)) {
6095                         ret = PTR_ERR(cap);
6096                         goto err_unregister;
6097                 }
6098
6099                 port->port_source_caps = cap;
6100         }
6101
6102         if (port->nr_snk_pdo) {
6103                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->snk_pdo,
6104                                port->nr_snk_pdo * sizeof(u32), 0);
6105                 caps.role = TYPEC_SINK;
6106
6107                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6108                 if (IS_ERR(cap)) {
6109                         ret = PTR_ERR(cap);
6110                         goto err_unregister;
6111                 }
6112
6113                 port->port_sink_caps = cap;
6114         }
6115
6116         return 0;
6117
6118 err_unregister:
6119         tcpm_port_unregister_pd(port);
6120
6121         return ret;
6122 }
6123
6124 static int tcpm_fw_get_caps(struct tcpm_port *port,
6125                             struct fwnode_handle *fwnode)
6126 {
6127         const char *opmode_str;
6128         int ret;
6129         u32 mw, frs_current;
6130
6131         if (!fwnode)
6132                 return -EINVAL;
6133
6134         /*
6135          * This fwnode has a "compatible" property, but is never populated as a
6136          * struct device. Instead we simply parse it to read the properties.
6137          * This it breaks fw_devlink=on. To maintain backward compatibility
6138          * with existing DT files, we work around this by deleting any
6139          * fwnode_links to/from this fwnode.
6140          */
6141         fw_devlink_purge_absent_suppliers(fwnode);
6142
6143         ret = typec_get_fw_cap(&port->typec_caps, fwnode);
6144         if (ret < 0)
6145                 return ret;
6146
6147         port->port_type = port->typec_caps.type;
6148         port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
6149
6150         port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
6151         if (port->port_type == TYPEC_PORT_SNK)
6152                 goto sink;
6153
6154         /* Get Source PDOs for the PD port or Source Rp value for the non-PD port */
6155         if (port->pd_supported) {
6156                 ret = fwnode_property_count_u32(fwnode, "source-pdos");
6157                 if (ret == 0)
6158                         return -EINVAL;
6159                 else if (ret < 0)
6160                         return ret;
6161
6162                 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
6163                 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
6164                                                      port->src_pdo, port->nr_src_pdo);
6165                 if (ret)
6166                         return ret;
6167                 ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo);
6168                 if (ret)
6169                         return ret;
6170         } else {
6171                 ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str);
6172                 if (ret)
6173                         return ret;
6174                 ret = typec_find_pwr_opmode(opmode_str);
6175                 if (ret < 0)
6176                         return ret;
6177                 port->src_rp = tcpm_pwr_opmode_to_rp(ret);
6178         }
6179
6180         if (port->port_type == TYPEC_PORT_SRC)
6181                 return 0;
6182
6183 sink:
6184         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
6185
6186         if (!port->pd_supported)
6187                 return 0;
6188
6189         /* Get sink pdos */
6190         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
6191         if (ret <= 0)
6192                 return -EINVAL;
6193
6194         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
6195         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
6196                                              port->snk_pdo, port->nr_snk_pdo);
6197         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
6198                                             port->nr_snk_pdo))
6199                 return -EINVAL;
6200
6201         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
6202                 return -EINVAL;
6203         port->operating_snk_mw = mw / 1000;
6204
6205         /* FRS can only be supported by DRP ports */
6206         if (port->port_type == TYPEC_PORT_DRP) {
6207                 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
6208                                                &frs_current);
6209                 if (ret >= 0 && frs_current <= FRS_5V_3A)
6210                         port->new_source_frs_current = frs_current;
6211         }
6212
6213         /* sink-vdos is optional */
6214         ret = fwnode_property_count_u32(fwnode, "sink-vdos");
6215         if (ret < 0)
6216                 ret = 0;
6217
6218         port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
6219         if (port->nr_snk_vdo) {
6220                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
6221                                                      port->snk_vdo,
6222                                                      port->nr_snk_vdo);
6223                 if (ret < 0)
6224                         return ret;
6225         }
6226
6227         /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6228         if (port->nr_snk_vdo) {
6229                 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6230                 if (ret < 0)
6231                         return ret;
6232                 else if (ret == 0)
6233                         return -ENODATA;
6234
6235                 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6236                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6237                                                      port->snk_vdo_v1,
6238                                                      port->nr_snk_vdo_v1);
6239                 if (ret < 0)
6240                         return ret;
6241         }
6242
6243         return 0;
6244 }
6245
6246 /* Power Supply access to expose source power information */
6247 enum tcpm_psy_online_states {
6248         TCPM_PSY_OFFLINE = 0,
6249         TCPM_PSY_FIXED_ONLINE,
6250         TCPM_PSY_PROG_ONLINE,
6251 };
6252
6253 static enum power_supply_property tcpm_psy_props[] = {
6254         POWER_SUPPLY_PROP_USB_TYPE,
6255         POWER_SUPPLY_PROP_ONLINE,
6256         POWER_SUPPLY_PROP_VOLTAGE_MIN,
6257         POWER_SUPPLY_PROP_VOLTAGE_MAX,
6258         POWER_SUPPLY_PROP_VOLTAGE_NOW,
6259         POWER_SUPPLY_PROP_CURRENT_MAX,
6260         POWER_SUPPLY_PROP_CURRENT_NOW,
6261 };
6262
6263 static int tcpm_psy_get_online(struct tcpm_port *port,
6264                                union power_supply_propval *val)
6265 {
6266         if (port->vbus_charge) {
6267                 if (port->pps_data.active)
6268                         val->intval = TCPM_PSY_PROG_ONLINE;
6269                 else
6270                         val->intval = TCPM_PSY_FIXED_ONLINE;
6271         } else {
6272                 val->intval = TCPM_PSY_OFFLINE;
6273         }
6274
6275         return 0;
6276 }
6277
6278 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6279                                     union power_supply_propval *val)
6280 {
6281         if (port->pps_data.active)
6282                 val->intval = port->pps_data.min_volt * 1000;
6283         else
6284                 val->intval = port->supply_voltage * 1000;
6285
6286         return 0;
6287 }
6288
6289 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6290                                     union power_supply_propval *val)
6291 {
6292         if (port->pps_data.active)
6293                 val->intval = port->pps_data.max_volt * 1000;
6294         else
6295                 val->intval = port->supply_voltage * 1000;
6296
6297         return 0;
6298 }
6299
6300 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6301                                     union power_supply_propval *val)
6302 {
6303         val->intval = port->supply_voltage * 1000;
6304
6305         return 0;
6306 }
6307
6308 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6309                                     union power_supply_propval *val)
6310 {
6311         if (port->pps_data.active)
6312                 val->intval = port->pps_data.max_curr * 1000;
6313         else
6314                 val->intval = port->current_limit * 1000;
6315
6316         return 0;
6317 }
6318
6319 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6320                                     union power_supply_propval *val)
6321 {
6322         val->intval = port->current_limit * 1000;
6323
6324         return 0;
6325 }
6326
6327 static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
6328                                           union power_supply_propval *val)
6329 {
6330         unsigned int src_mv, src_ma, max_src_uw = 0;
6331         unsigned int i, tmp;
6332
6333         for (i = 0; i < port->nr_source_caps; i++) {
6334                 u32 pdo = port->source_caps[i];
6335
6336                 if (pdo_type(pdo) == PDO_TYPE_FIXED) {
6337                         src_mv = pdo_fixed_voltage(pdo);
6338                         src_ma = pdo_max_current(pdo);
6339                         tmp = src_mv * src_ma;
6340                         max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
6341                 }
6342         }
6343
6344         val->intval = max_src_uw;
6345         return 0;
6346 }
6347
6348 static int tcpm_psy_get_prop(struct power_supply *psy,
6349                              enum power_supply_property psp,
6350                              union power_supply_propval *val)
6351 {
6352         struct tcpm_port *port = power_supply_get_drvdata(psy);
6353         int ret = 0;
6354
6355         switch (psp) {
6356         case POWER_SUPPLY_PROP_USB_TYPE:
6357                 val->intval = port->usb_type;
6358                 break;
6359         case POWER_SUPPLY_PROP_ONLINE:
6360                 ret = tcpm_psy_get_online(port, val);
6361                 break;
6362         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6363                 ret = tcpm_psy_get_voltage_min(port, val);
6364                 break;
6365         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6366                 ret = tcpm_psy_get_voltage_max(port, val);
6367                 break;
6368         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6369                 ret = tcpm_psy_get_voltage_now(port, val);
6370                 break;
6371         case POWER_SUPPLY_PROP_CURRENT_MAX:
6372                 ret = tcpm_psy_get_current_max(port, val);
6373                 break;
6374         case POWER_SUPPLY_PROP_CURRENT_NOW:
6375                 ret = tcpm_psy_get_current_now(port, val);
6376                 break;
6377         case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
6378                 tcpm_psy_get_input_power_limit(port, val);
6379                 break;
6380         default:
6381                 ret = -EINVAL;
6382                 break;
6383         }
6384
6385         return ret;
6386 }
6387
6388 static int tcpm_psy_set_online(struct tcpm_port *port,
6389                                const union power_supply_propval *val)
6390 {
6391         int ret;
6392
6393         switch (val->intval) {
6394         case TCPM_PSY_FIXED_ONLINE:
6395                 ret = tcpm_pps_activate(port, false);
6396                 break;
6397         case TCPM_PSY_PROG_ONLINE:
6398                 ret = tcpm_pps_activate(port, true);
6399                 break;
6400         default:
6401                 ret = -EINVAL;
6402                 break;
6403         }
6404
6405         return ret;
6406 }
6407
6408 static int tcpm_psy_set_prop(struct power_supply *psy,
6409                              enum power_supply_property psp,
6410                              const union power_supply_propval *val)
6411 {
6412         struct tcpm_port *port = power_supply_get_drvdata(psy);
6413         int ret;
6414
6415         /*
6416          * All the properties below are related to USB PD. The check needs to be
6417          * property specific when a non-pd related property is added.
6418          */
6419         if (!port->pd_supported)
6420                 return -EOPNOTSUPP;
6421
6422         switch (psp) {
6423         case POWER_SUPPLY_PROP_ONLINE:
6424                 ret = tcpm_psy_set_online(port, val);
6425                 break;
6426         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6427                 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6428                 break;
6429         case POWER_SUPPLY_PROP_CURRENT_NOW:
6430                 if (val->intval > port->pps_data.max_curr * 1000)
6431                         ret = -EINVAL;
6432                 else
6433                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6434                 break;
6435         default:
6436                 ret = -EINVAL;
6437                 break;
6438         }
6439         power_supply_changed(port->psy);
6440         return ret;
6441 }
6442
6443 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6444                                    enum power_supply_property psp)
6445 {
6446         switch (psp) {
6447         case POWER_SUPPLY_PROP_ONLINE:
6448         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6449         case POWER_SUPPLY_PROP_CURRENT_NOW:
6450                 return 1;
6451         default:
6452                 return 0;
6453         }
6454 }
6455
6456 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6457         POWER_SUPPLY_USB_TYPE_C,
6458         POWER_SUPPLY_USB_TYPE_PD,
6459         POWER_SUPPLY_USB_TYPE_PD_PPS,
6460 };
6461
6462 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6463
6464 static int devm_tcpm_psy_register(struct tcpm_port *port)
6465 {
6466         struct power_supply_config psy_cfg = {};
6467         const char *port_dev_name = dev_name(port->dev);
6468         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6469                                      strlen(port_dev_name) + 1;
6470         char *psy_name;
6471
6472         psy_cfg.drv_data = port;
6473         psy_cfg.fwnode = dev_fwnode(port->dev);
6474         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6475         if (!psy_name)
6476                 return -ENOMEM;
6477
6478         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6479                  port_dev_name);
6480         port->psy_desc.name = psy_name;
6481         port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6482         port->psy_desc.usb_types = tcpm_psy_usb_types;
6483         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6484         port->psy_desc.properties = tcpm_psy_props;
6485         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6486         port->psy_desc.get_property = tcpm_psy_get_prop;
6487         port->psy_desc.set_property = tcpm_psy_set_prop;
6488         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6489
6490         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6491
6492         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6493                                                &psy_cfg);
6494
6495         return PTR_ERR_OR_ZERO(port->psy);
6496 }
6497
6498 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6499 {
6500         struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6501
6502         if (port->registered)
6503                 kthread_queue_work(port->wq, &port->state_machine);
6504         return HRTIMER_NORESTART;
6505 }
6506
6507 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6508 {
6509         struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6510
6511         if (port->registered)
6512                 kthread_queue_work(port->wq, &port->vdm_state_machine);
6513         return HRTIMER_NORESTART;
6514 }
6515
6516 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6517 {
6518         struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6519
6520         if (port->registered)
6521                 kthread_queue_work(port->wq, &port->enable_frs);
6522         return HRTIMER_NORESTART;
6523 }
6524
6525 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6526 {
6527         struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6528
6529         if (port->registered)
6530                 kthread_queue_work(port->wq, &port->send_discover_work);
6531         return HRTIMER_NORESTART;
6532 }
6533
6534 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6535 {
6536         struct tcpm_port *port;
6537         int err;
6538
6539         if (!dev || !tcpc ||
6540             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6541             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6542             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6543                 return ERR_PTR(-EINVAL);
6544
6545         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6546         if (!port)
6547                 return ERR_PTR(-ENOMEM);
6548
6549         port->dev = dev;
6550         port->tcpc = tcpc;
6551
6552         mutex_init(&port->lock);
6553         mutex_init(&port->swap_lock);
6554
6555         port->wq = kthread_create_worker(0, dev_name(dev));
6556         if (IS_ERR(port->wq))
6557                 return ERR_CAST(port->wq);
6558         sched_set_fifo(port->wq->task);
6559
6560         kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6561         kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6562         kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6563         kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6564         kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6565         hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6566         port->state_machine_timer.function = state_machine_timer_handler;
6567         hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6568         port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6569         hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6570         port->enable_frs_timer.function = enable_frs_timer_handler;
6571         hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6572         port->send_discover_timer.function = send_discover_timer_handler;
6573
6574         spin_lock_init(&port->pd_event_lock);
6575
6576         init_completion(&port->tx_complete);
6577         init_completion(&port->swap_complete);
6578         init_completion(&port->pps_complete);
6579         tcpm_debugfs_init(port);
6580
6581         err = tcpm_fw_get_caps(port, tcpc->fwnode);
6582         if (err < 0)
6583                 goto out_destroy_wq;
6584
6585         port->try_role = port->typec_caps.prefer_role;
6586
6587         port->typec_caps.fwnode = tcpc->fwnode;
6588         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
6589         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
6590         port->typec_caps.svdm_version = SVDM_VER_2_0;
6591         port->typec_caps.driver_data = port;
6592         port->typec_caps.ops = &tcpm_ops;
6593         port->typec_caps.orientation_aware = 1;
6594
6595         port->partner_desc.identity = &port->partner_ident;
6596         port->port_type = port->typec_caps.type;
6597
6598         port->role_sw = usb_role_switch_get(port->dev);
6599         if (!port->role_sw)
6600                 port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
6601         if (IS_ERR(port->role_sw)) {
6602                 err = PTR_ERR(port->role_sw);
6603                 goto out_destroy_wq;
6604         }
6605
6606         err = devm_tcpm_psy_register(port);
6607         if (err)
6608                 goto out_role_sw_put;
6609         power_supply_changed(port->psy);
6610
6611         err = tcpm_port_register_pd(port);
6612         if (err)
6613                 goto out_role_sw_put;
6614
6615         port->typec_caps.pd = port->pd;
6616
6617         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6618         if (IS_ERR(port->typec_port)) {
6619                 err = PTR_ERR(port->typec_port);
6620                 goto out_unregister_pd;
6621         }
6622
6623         typec_port_register_altmodes(port->typec_port,
6624                                      &tcpm_altmode_ops, port,
6625                                      port->port_altmode, ALTMODE_DISCOVERY_MAX);
6626         port->registered = true;
6627
6628         mutex_lock(&port->lock);
6629         tcpm_init(port);
6630         mutex_unlock(&port->lock);
6631
6632         tcpm_log(port, "%s: registered", dev_name(dev));
6633         return port;
6634
6635 out_unregister_pd:
6636         tcpm_port_unregister_pd(port);
6637 out_role_sw_put:
6638         usb_role_switch_put(port->role_sw);
6639 out_destroy_wq:
6640         tcpm_debugfs_exit(port);
6641         kthread_destroy_worker(port->wq);
6642         return ERR_PTR(err);
6643 }
6644 EXPORT_SYMBOL_GPL(tcpm_register_port);
6645
6646 void tcpm_unregister_port(struct tcpm_port *port)
6647 {
6648         int i;
6649
6650         port->registered = false;
6651         kthread_destroy_worker(port->wq);
6652
6653         hrtimer_cancel(&port->send_discover_timer);
6654         hrtimer_cancel(&port->enable_frs_timer);
6655         hrtimer_cancel(&port->vdm_state_machine_timer);
6656         hrtimer_cancel(&port->state_machine_timer);
6657
6658         tcpm_reset_port(port);
6659
6660         tcpm_port_unregister_pd(port);
6661
6662         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6663                 typec_unregister_altmode(port->port_altmode[i]);
6664         typec_unregister_port(port->typec_port);
6665         usb_role_switch_put(port->role_sw);
6666         tcpm_debugfs_exit(port);
6667 }
6668 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6669
6670 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6671 MODULE_DESCRIPTION("USB Type-C Port Manager");
6672 MODULE_LICENSE("GPL");